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this-week-in-rust · 2 years ago

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This Week in Rust 463

Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tweet us at @ThisWeekInRust or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

Official

Announcing the Rust Style Team

Foundation

Rust Foundation Project Grants are open for applications

Project/Tooling Updates

cargo careful: run your Rust code with extra careful debug checking

Async UI: a Rust UI Library where Everything is a Future

rust-analyzer changelog #149

Observations/Thoughts

How (and why) nextest uses tokio, part 1

in-place constructors

Quirks of Rust’s token representation

Brute forcing protected ZIP archives in Rust

This week in Fluvio #47: The programmable streaming platform

Rust Walkthroughs

How to call a C function from Rust (A simple FFI tutorial)

Rewriting the Modern Web in Rust

Implementing truly safe semaphores in rust

Model an ALU in Rust

6 things you can do with the Cow 🐄 in Rust 🦀

Platform Agnostic Drivers in Rust: MAX7219 Naive Code Refactoring

Last mile DynamoDB: Deno Deploy edition

Miscellaneous

The Initial Rust Infrastructure Has Been Merged Into Linux 6.1

Crate of the Week

This week's crate is humansize, a size formatting crate. Now in version 2.0, with an updated API.

Thanks, Leopold Arkham for the suggestion!

Please submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but didn't know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

AeroRust website - Add an aerospace related crate #Hacktoberfest

nmea - Supporting additional sentences #Hacktoberfest

AeroRust website - Request for content

zerocopy - test_new_error fails on i686

zerocopy - test_as_bytes_methods fails on powerpc

zerocopy - Miri can't run tests for wasm32-wasi target

Ockam - Prototype UDP NAT hole punching

Ockam - Refactor ockam secure-channel listener create command to use rpc

Ockam - Split CBOR / Messaging API schema.cddl

If you are a Rust project owner and are looking for contributors, please submit tasks here.

Updates from the Rust Project

367 pull requests were merged in the last week

libc: add major/minor/makedev on apple OSes

miri: Add flag to specify the number of cpus

cargo: Iteratively construct target cfg

rustdoc-Json: List impls for primitives

clippy: Implement manual_clamp lint

clippy: Silence [question_mark] in const context

clippy: [manual_assert]: Preserve comments in the suggestion

clippy: [unnecessary_lazy_evaluations] Do not suggest switching to early evaluation when type has custom Drop

clippy: add box-default lint

clippy: fix [needless_borrow], [explicit_auto_deref] FPs on unions

clippy: let upper_case_acronyms check the enum name

clippy: let unnecessary_cast work for trivial non_literal expressions

clippy: lint nested patterns and slice patterns in needless_borrowed_reference

clippy: new implicit_saturating_add lint

rust-analyzer: Add proc-macro dependency to rustc crates

rust-analyzer: Fix PackageInformation having the crate name instead of package name

rust-analyzer: Fix annotations not resolving when lens location is set to whole item

rust-analyzer: Fix find_path using the wrong module for visibility calculations

rust-analyzer: Fix move_format_string_arg being tokentree unaware

rust-analyzer: Fix requests not being retried anymore

rust-analyzer: Fix trait impl item completions using macro file text ranges

rust-analyzer: Fix type alias hovers not rendering generic parameters

rust-analyzer: Use cfg(any()) instead of cfg(FALSE) for disabling proc-macro test

ci: Replace volta-cli/action with builtin functionality from actions/setup-node

docs.rs: new cache-policy & cache middleware structure to support full page caching

add #[rustc_safe_intrinsic]

add a niche to Duration, unix SystemTime, and non-apple Instant

add diagnostic struct for const eval error in rustc_middle

add negation methods for signed non-zero integers

added more const_closure functionality

adjust the s390x data layout for LLVM 16

compute lint levels by definition

fix #[derive(Default)] on a generic #[default] enum adding unnecessary Default bounds

fix format_args capture for macro expanded format strings

fix associated type bindings with anon const in GAT position

fix integer overflow in format!("{:.0?}", Duration::MAX)

generate synthetic region from impl even in closure body within an associated fn

get rid of exclude-list for Windows-only tests

serialize return-position impl Trait in trait hidden values in foreign libraries

stabilize #![feature(mixed_integer_ops)]

stabilize bench_black_box

use let-chaining in WhileTrue::check_expr

introduce {char, u8}::is_ascii_octdigit

macros: diagnostic derive on enums

add a filter for try commits in graphs, compare page and triage

codegen_gcc: Implement llvm.prefetch

codegen_gcc: simd: enable simd_as intrinsic

codegen_gcc: simd: implement float math intrinsics

allow users to debug their processes

Rust Compiler Performance Triage

A great week, with 170 primary benchmark scenarios seeing improvement. Every PR flagged by perf provided at least some wins, and perhaps more impressive: No rollup PR's were flagged by perf this week! Furthermore, cjgillot fixed an issue where incremental compilation was being unnecessarily hindered by our span and lint system. Great work everyone!

Triage done by @pnkfelix. Revision range: d9297d22..02cd79af

Full report here

Call for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization. The following RFCs would benefit from user testing before moving forward:

No RFCs issued a call for testing this week.

If you are a feature implementer and would like your RFC to appear on the above list, add the new call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

No RFCs were approved this week.

Final Comment Period

Every week, the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

RFCs

No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

[disposition: merge] make const_err a hard error

[disposition: merge] Elaborate supertrait bounds when triggering unused_must_use on impl Trait

[disposition: merge] Stabilize proc_macro Span::source_text

[disposition: merge] const-stablilize NonNull::as_ref

[disposition: merge] Add documentation about the memory layout of UnsafeCell<T>

[disposition: merge] Handle projections as uncovered types during coherence check

[disposition: merge] Never panic in thread::park and thread::park_timeout

[disposition: merge] Stabilize nonzero_bits

[disposition: merge] EscapeAscii is not an ExactSizeIterator

[disposition: merge] Change default level of INVALID_HTML_TAGS to warning and stabilize it

[disposition: merge] Add Box<[T; N]>: TryFrom<Vec<T>>

[disposition: merge] add no_compile doctest attribute

New and Updated RFCs

No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2022-10-05 - 2022-11-02 🦀

Virtual

2022-10-05 | Virtual (Indianapolis, IN, US) | Indy Rust

Indy.rs - with Social Distancing

2022-10-05 | Virtual (Stuttgart, DE) | Rust Community Stuttgart

Rust-Meetup

2022-10-06 | Virtual (Nürnberg, DE) | Rust Nuremberg

Rust Nürnberg online #18

2022-10-08 | Virtual | Rust GameDev

Rust GameDev Monthly Meetup

2022-10-11 | Virtual (Berlin, DE) | Open TechSchool Berlin

Rust Hack and Learn

2022-10-11 | Virtual (Dallas, TX, US) | Dallas Rust

Second Tuesday

2022-10-11 | Virtual (Saarbrücken, DE) | Rust-Saar

Meetup: 23u16

2022-10-11 | Virtual (Weiden, DE) | Digital Craftsmanship Nordoberpfalz

Woher kommt der Hype? Rust in 45 Minuten

2022-10-12 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust

Monthly Meetup

2022-10-12 | Virtual (Erlangen, DE) | Rust Franken

Rust Franken Meetup #4

2022-10-12 | Virtual (San Francisco, CA, US / Redmond, WA, US / London, UK) | Microsoft Reactor San Francisco

Getting Started with Rust: Building Rust Projects | Redmond Reactor Mirror Event | London Reactor Mirror Event

2022-10-13 | Virtual (Berlin, DE) | EuroRust

EuroRust (Oct 13-14)

2022-10-15 | Virtual (Nürnberg, DE) | Rust Nuremberg

Deep Dive Session 2 (CuteCopter): Reverse Engineering a tiny drone

2022-10-18 | Virtual (Washington, DC, US) | Rust DC

Mid-month Rustful—Impractical Rust: The HATETRIS World Record

2022-10-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust

Rapid Prototyping in Rust: Write fast like Python; Run fast like C

2022-10-20 | Virtual (Stuttgart, DE) | Rust Community Stuttgart

Rust-Meetup

2022-10-25 | Virtual (Dallas, TX, US) | Dallas Rust

Last Tuesday

2022-10-26 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond

Your First Rust Project: Rust Basics

2022-10-27 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup

Using Applicative Functors to parse command line options

2022-11-01 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup

Buffalo Rust User Group, First Tuesdays

2022-11-02 | Virtual (Indianapolis, IN, US) | Indy Rust

Indy.rs - with Social Distancing

2022-11-02 | Virtual (Redmond, WA, US / San Francisco, SF, US) | Microsoft Reactor Redmond

Getting Started with Rust: From Java Dev to Rust Developer | San Francisco Reactor Mirror Event | London Reactor Mirror Event

Asia

2022-10-11 | Tokyo, JP | Tokyo Rust Meetup

Cost-Efficient Rust in Practice

Europe

2022-10-06 | Wrocław, PL | Rust Wrocław

Rust Wrocław Meetup #29

2022-10-12 | Berlin, DE | Rust Berlin

Rust and Tell - EuroRust B-Sides

2022-10-13 | Berlin, DE + Virtual | EuroRust

EuroRust (Oct 13-14)

2022-10-25 | Paris, FR | Rust Paris

Rust Paris meetup #53

North America

2022-10-13 | Columbus, OH, US | Columbus Rust Society

Monthly Meeting

2022-10-18 | San Francisco, CA, US | San Francisco Rust Study Group

Rust Hacking in Person

2022-10-20 | New York, NY, US | Rust NYC

Anyhow ? Turbofish ::<> / HTTP calls and errors in Rust.

2022-10-20 | New York, NY, US | Cloud Native New York

Cloud-native Search Engine for Log Management and Analytics.

2022-10-25 | Toronto, ON, CA | Rust Toronto

Rust DHCP

2022-10-27 | Lehi, UT, US | Utah Rust

Bevy Crash Course with Nathan and Food!

Oceania

2022-10-10 | Sydney, NSW, AU | Rust Sydney

Rust Lightning Talks

2022-10-20 | Wellington, NZ + Virtual | Rust Wellington

Tune Up Edition: software engineering management

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

BurntSushi is a super experienced programmer who always seems to know what’s right

Shepmaster occasionally pops up to keep things level, and provides definitive answers and edits to all stackoverflow questions

Epage is the ecosystem guy thanklessly maintaining the things that make the magic of cargo possible

Dtolnay is an AI written in rust with the sole purpose of improving rust.

– trevg_123 on r/rust

Thanks to musicmatze for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin, bennyvasquez.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

#rust-lang #rust #rustlang #twir #long post

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devstoc · 2 years ago

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Just added the implementation of retry and circuit breaker pattern in C# check out my article: https://devstoc.com/post?p=retry-and-circuit-breaker-pattern-using-polly

#circuitBreakerPattern #csharppatterns #devstocArticles #cSharp #csharpPatterns #polly

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takonei · 5 years ago

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Beta AU - Main story: Chapter 1, daily life

Note of the author: Please note that some events don’t go exactly like the main game. For example, no one is a detective, and the “main duo” isn’t a thing, so events will occur differently.

Also, there is a possibility I will write entirely scenes that I consider important or that I cannot just sum up. Not gonna spoil anything but that will be the case of about… Well the entire 5th and 6th trial, and some other scenes.

Also yeah, when I talked about the “one week between chapters” I meant one week before revealing another death.

Chapter 1: Pledge your allegiance to me - Daily life

...

Monokuma gave them the monopads and the rest of the rules.

After the “entrance ceremony” none of them knew what to do.

Korekiyo suggested they explored the academy in groups to find maybe a hint about an escape or anything, and communicate any information they found with the others.

Tenko interrupts him, saying she found a manhole behind the building, but wasn’t sure if it led somewhere, since she wasn’t able to take it off.

She guides them there, but Ryoma and Tsumugi, don’t think this will lead anywhere.

Kaede suggests K1-B0 to try to take it off, since he is a robot.

K1-B0, despite having a greater strength than most, can barely make it move.

Gonta suggests he tries, and does it with ease. Tenko compliments his strength, that some others like Kokichi And Miu find a bit scary.

They look around the underground passage, but Korekiyo and Tsumugi suggest that it might be a trap, since Monokuma didn’t try to stop them.

Angie and Himiko say that there is still a chance, and even though it might be a trap, a team full of ultimates can surpass it.

They all try to get through the passage, but it’s a failure.

The positive ones try to comfort the injured, but some already gave up.

Monokuma and the monokubs appear saying they knew they would find the passage.

Kaito comments on their sadistic nature to leave a small glimmer of fake hope to them.

Tsumugi adds that they wouldn’t have let them go if it was really an escape.

They retry once again, just to see what even is at the end of the tunnel.

After another failure, Korekiyo suggests they stop for now, as they’re all unable to continue, and this will lead to nowhere if they’re in this state.

Himiko argues saying they can’t just leave this here, that they have to know what’s at the end.

Ryoma suggests they return once they’re fully prepared.

They were interrupted by the night time announcement.

Shuichi suggests they go to sleep and decide what to do the next day, since they’re all exhausted.

They all agree and most of them go to sleep.

Some stay outside for a while, Himiko looking at the stars, Kaede writing in a notebook, and Miu just taking a walk.

The next day, everyone reunited in the dining hall. Thankfully no one was killed.

They discussed what they should do, some of them already pleading not to return to the underground passage.

K1-B0 suggests they look around the academy to find perhaps something to help them.

Rantaro agrees, since it’s the only solution they have.

Korekiyo suggests they do it in groups.

The groups were organized by four. Group A was Shuichi, Rantaro, Maki and Kaede; group B was Kokichi, Himiko, Angie and K1-B0; group C was Miu, Kaito, Ryoma and Kirumi; and group D was Tenko, Gonta, Korekiyo and Tsumugi.

Monokuma pops out of nowhere and introduces the first blood perk, that the first person to kill another will be free to go without any consequences.

Himiko stepped in, saying that no one would try to kill like this. Tenko does as well, saying she is going to fight him.

The monokubs with an exisal come in, ready to at least threaten Tenko when Monokuma gets crushed by it.

They panic, saying that they’re the new headmasters now, and will still corner them like rats if they even tried to do anything against the rules.

They leave the rest of the students to themselves.

Kirumi suggests now is the perfect time to explore the academy, and find perhaps another way to escape.

The groups separate.

Group A explored the first floors of the main building. Shuichi was somehow leading the group. Kaede insisted on exploring the library if they found anything useful, to which Maki decided to stick with her and let the other two explore other places. Rantaro noticed the food in the kitchen looked like it was fresh and restored only recently.

Group B had to split up after Kokichi said he didn’t feel good. Himiko tried to stick with him but got rejected after he locked himself in his room. Angie and K1-B0 continued their researches outside on their own after getting Himiko back.

Group C explored buildings other than the main building. Miu noticed what looked like a casino behind one of the walls, Ryoma saying Monokuma probably didn’t want them to be here yet, which was another reason to try to go there. Kirumi suggests they should at least tell the others before doing anything stupid. Kaito agrees.

Group D explored the opened floors as well. None of the doors were unlocked, which disappointed them. Tsumugi suggested that if this was indeed a killing game, those doors would probably open once a murder occurs. Korekiyo, as much as he didn’t want it to be right, agreed. Tenko and Gonta tried to cheer them up to say they weren’t going to die so easily.

After that they all reunited and told the others about what they found. Unfortunately none of the things they found were really interesting.

The next day, after chatting for a bit, Monokuma suddenly showed up and presented another motive: The time limit. If two days from this day, at nighttime, no one had died, everyone would die.

Of course, no one was accepting this, but trust was already a foreign notion, so they all went their ways, except for Shuichi, Rantaro, Tenko, Gonta, Kirumi and K1-B0, who stayed in the dining hall to think about a plan.

After thinking about the possibilities, they eventually thought it would be better to try to search through the academy once again to find something better to do.

Some time later, Shuichi found Kokichi and Himiko talking to K1-B0. Mostly Himiko, since Kokichi kept his distance with the other two. After joining in, Himiko explained to Shuichi that perhaps they could consider calling “K1-B0” “Keebo” instead, since it was easier to pronounce and it felt more human than two letters and numbers. The robot seemed indifferent, but didn’t mind being called Keebo. Himiko seemed satisfied and was ready to tell everyone, grabbing Kokichi by the hand and running through the hallways, even though judging by Kokichi’s reaction, he wasn’t comfortable being dragged around like that.

He also came across Maki, who seemed glad somehow. When asked, she responded that her lab opened, and that she would perhaps find something to do to distract her from the fact that they could die in a few days.

Shuichi also realized his lab was opened. After looking around for a few minutes, he turned back to see that Ryoma and Rantaro entered as well, glancing at what the violinist’s lab with admiration. Ryoma commented how Monokuma specifically opened the labs for the people who probably wouldn’t be able to fight back against him.

When afternoon came, Tenko announced to anyone she could find that she and Gonta would do a martial art match, to test the other’s strength, and if they wanted to see it, they would be welcome, since Tenko’s lab opened that day.

A few people joined Tenko and Gonta to watch their match: Himiko (who dragged Kokichi there), Kirumi, who said that a request for her presence shall be fulfilled, Ryoma, Rantaro and Shuichi.

Kirumi commented on how the match opposed brute strength and technique, and understood why Tenko wanted to do this match. Rantaro seemed to agree, but was prepared just in case someone was injured. He didn’t have access to great resources, but he would do his best.

The match ended with Tenko winning, which was not really surprising, but their match was a close call. The two shook hands as a sign of respect. Tenko advised Gonta on how he could improve his technique, because someone could easily defeat him if the opponent has a weapon on them and know the basics in fighting.

The evening, Shuichi noticed on his notepad Rantaro and Ryoma in the warehouse. He felt bad just standing there without doing anything, so he decided to check on them and see if he could try to do something. When he arrived, he saw the two with different items scattered around, some boxes emptied of their content.

The two said they would try to see if they had any material for Ryoma to build something to use against Monokuma. Of course he didn’t have the necessary tools, but it would be better than nothing. Shuichi helped with their research.

Nighttime came and they all decided to end here, Ryoma bringing the most useful items to his room to try to at least think about something. They agreed not to talk to anyone about this.

The next day, Shuichi decided to search his own lab through and through, to help Ryoma and Rantaro in their mission to collect things to fight Monokuma. Unfortunately his lab didn’t have much.

He then decides to check the library to perhaps find something useful. Some time later Angie showed up with the same intention as Shuichi, from what she was saying.

After searching through the books, Angie noticed that it was weird that all the shelves had books on it except one, and perhaps something was there. Shuichi brushed it off but Angie insisted, saying that it was very strange to leave only one like this when there a lot of books scattered around on the floor and yet this bookshelf didn’t have anything on it.

They decided to inspect it, and after Angie brushed some of the books, the bookshelf moved to reveal the door. With its distinct pattern, they came with the conclusion that Monokuma used that door to do something in a secret room, and it was afraid protecting it with exisals wasn’t enough.

They decided to tell the rest of the group at lunchtime since they didn’t have anything to lose.

The afternoon was spent by most of of them as finding ways to go through the door, but no one was able to do anything.

Around the evening the music started playing, making everyone panic.

BGM: Let’s kill each other

They were all in different groups, but Shuichi was with Kaito, Miu, Rantaro and Ryoma at the time.

They all went to the game room to see if there was anything that could be used as a weapon, or at least something. Besides, as Ryoma said, the basement would be harder to reach for the exisals.

Some time later, the monitors announced only one hour was left.

Just a few minutes later, Angie went in to say almost all of them were in the library preparing something at the door they found earlier.

Unfortunately nothing much could have been done for the door. Ryoma suggested they went back to the warehouse to see if anything could be found.

Thus, Shuichi, Ryoma, Tenko and Keebo went to the warehouse, prepared in case Monokuma decided to do something.

They went through the boxes one last time, but something caught Shuichi’s eye, behind one of the shelves.

It’s only after approaching that he discovered the harsh truth.

There was a dead body stabbed several times in the chest, laying against the wall, on the floor.

The victim was Gonta Gokuhara, the ultimate zoologist.

#ndrv3 #danganronpa v3 #ndrv3 au #beta au #main story

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1358456 · 5 years ago

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Review Response, Feb 16-22, 2020

Accidentally posted without completing it, so... retry!

DE #001

1) Can hear my pokemon fanfic idea, I can come up with trainer team and how he got them, the idea is that didn’t show up late and got charmander as kids starter an the Oc/Mc got pikachu, they travel together but ever now and then they split up and meet up again. If you want to hear more PM me

... The f*ck?

----------------------------------------------------------------------------------------------------------

DE #035

1) Usually I would still complain about G/B pairing, but I figured it's kinda annoying so I'll stop now :) Maybe I should write the chapters myself if I'm that desperate, haha. But in all honestly, thanks for including R/B. Almost all of the characters in recent chapters were from Gens 5-7, so this really brought me back to when I was a kid reading SE, as well as the early days of DE (though I wasn't a fan of the dark G/B chapters). I really hope you bring back G/S, R/S and D/P... because I enjoy those pairings more and also just for old time's sake :)

Annoying? Not really. But it’s pointless to complain about it, so... why not save the effort, right? DE does focus a lot on the junior side, since my interest in the seniors have faded. Though by “seniors”, I only mean the Johto and Hoenn pairings. Red & Blue is still “new”...ish (newer than Black & White for me, given when the pairing shift happened), so that’ll happen a lot more.

Not a fan of the darker Green & Blue chapters, huh? Well... given their personalities, it was kind of inevitable. But with Red & Blue, it’s now impossible to have a dark chapter. So only fluff!

I assume you mean G/C and not the other one. Now, Gold & Crystal is unlikely to make it into DE as a primarily focused chapter. It might appear in one of those multi-pairing chapters. Same deal for Ruby & Sapphire. Diamond & Platinum is going to be appearing a lot. So no need to worry!

-----------------------------------------------------------------------------------------------------------

Hm. As usual, there’s no reason to look at DE’s chart given the total lack of any discernible pattern. Just up and down and up and down and...

#qna

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xpressloading751 · 3 years ago

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Dbz Battle Of Z

Dragon Ball Z: Battle of ZDeveloper(s)ArtdinkPublisher(s)Bandai Namco Games(a)Composer(s)Shunsuke Kikuchi Toshiyuki Kishi Hisao Sasaki Takao NagataniSeriesDragon BallPlatform(s)PlayStation 3, Xbox 360, PlayStation VitaRelease

JP: January 23, 2014

EU: January 24, 2014

NA: January 28, 2014

Genre(s)Action role-playingMode(s)Single-player, multiplayer

Dragon Ball Z: Battle of Z is an action role-playing game based on the manga and anime franchise Dragon Ball. It was developed by Artdink and published by Bandai Namco Games. The game promotes the release of the film Dragon Ball Z: Battle of Gods, featuring the first video game appearance of Goku's Super Saiyan God form(1) as well as the characters Beerus and Whis.

Gameplay(edit)

Battle of Z is a team fighting action title that lets up to eight players battle it out against one another. The game supports up to four players in cooperative play, and lets players perform attacks together and heal one another. It also supports online multiplayer battles,(2) and PS Vita ad-hoc connection. A multiplayer restriction in this game is that two players can not play on the same console; the developers say this is due to wanting a player having the best possible graphics in full screen. Battle of Z features over 70 characters, as well as team battles against giant characters such as Great ApeVegeta, Great Ape Gohan, and Hirudegarn.

Doragon Bōru Zetto Kami to Kami, lit. Dragon Ball Z: God and God) is the eighteenth Dragon Ball movie and the fourteenth under the Dragon Ball Z brand. It premiered in Japanese theaters on March 30, 2013. Dragon Ball Z® Battle of Z delivers original and unique fi ghting gameplay in the beloved world from series' creator Akira Toriyama. Focusing on team battles, players will be able to battle online with or against their friends in frantic 4-player co-op or up to 8-player vs. Jan 28, 2014 Dragon Ball Z Battle of Z delivers original and unique fighting gameplay in the beloved world from series' creator Akira Toriyama. Focusing on team battles, players will be able to battle online with or against their friends in frantic 4-player co-op or up to 8-player vs. Dragon Ball Z: Battle of Z is yet another fighting game set in a popular universe we all know from comics, TV series, as well as movies. The production was handled by Japanese studio known as Artdink and it was their first game from this cycle.

The game features more than 70 characters. Instead of transformations grouped together into one character, they are separated into each transformation each. The pre-order offer comes in with two in-game DLC characters: Super Vegito and Super SaiyanBardock, available via pre-order across Europe, America, and Australasia. Day 1 Edition includes a bonus DLC code for Goku in Naruto Sage Mode costume.

The game's key feature is team battle action of four versus four.(3) Teammates share a special energy meter called Genki Gauge. This meter increases when attacking opponents and, when filled, allows the character to perform an ultimate attack.(4) Any of the teammates can decide to give or use energy from the gauge in order to perform an attack. Playable characters can team up to perform techniques such as Synchro Rush, Meteor Chain, and Revive Soul. Meteor Chain involves partners teaming up to launch attack after attack, following up each other's attacks and timing it so the opponent has no time to counter.(3) Using Meteor Chains is an effective way to get the GENKI Gauge to fill up quickly.(4) Synchro Rush is rushing the opponent at the same time, resulting in simultaneous hits. Revive Soul is reviving a fallen partner, giving them energy to get back in the battle.(3) Also, thanks to Energy Share, teammates can share ki with each others.(4) Villains can team up with Heroes in the game, but they do not show appreciation when given ki or extra energy to heal.

There are four different battle types for playable characters:

Melee Type: skilled at close combat, can combo with melee attacks. Attack Type moves are Kaio-ken Attack, Dance of the Sword, Recoome Kick.

Ki Blast Type: skilled at long range battle, can make consecutive attacks using the Genki Gauge. Ki Blast Type moves are Consecutive Energy Blast, Death Beam, Spirit Ball.

Support Type: powers such as health regeneration and support abilities. Support Type moves are Health regain blast, Fighting Pose.

Interfere Type: adept at abilities that interfere with the enemy's movements. Interference Type moves are Solar Flare, Chocolate Beam, Drain Energy.

There is a unique feature system that allows players to modify (edit) characters using ability/or customization cards. By collecting and equipping cards, characters that might not be suited to battle can be boosted to make them more capable, alternatively they can be given abilities that make their natural strengths more pronounced.(5)

Modes(edit)

Game modes include Single Missions, Multi Missions, and Team Battles.

Single Mission

In this mode, it is possible to fight as either the Z Fighters or their antagonists. 60 missions are featured, ordered in Saiyan Saga (Z Fighters route and Saiyan route), Frieza Saga (Z Fighters route and Planet Trade Organization route), Cell Saga (Z Fighters route and Androids route), Majin Buu Saga (Z Fighters route and Majin Buu route), Another Age, Extra Age, and Special Age. The original manga/anime story is modified to include team battles, such as the fight with Frieza which, instead of Goku being the only character to face the tyrant, also includes Piccolo, Gohan, and Krillin for the final battle on Namek. Also included is a special history which is based on the Saiyans if something involving them had happened differently. Another scenario made for the game has a battle against all of Goku's family, including Bardock and Goten.

Co-op Battle

This mode allows four players to join online to complete missions in cooperation. It allows players who have difficulty to complete missions alone to find means to complete them online.

Battle Mode

Dbz Battle Of Z - Image Results

This mode includes Shin Battle Mode and Battle Royal. Shin Battle Mode allows up to 4 players to join in order to complete missions in a competition, and Battle Royal allows the combatants to fight against each other not organized in teams. The game has four different battle modes- normal battle, score battle, Battle Royal, and Dragon Ball Grab.

Normal Battle

This is a standard 4-on-4 battle. Each team is allotted the ability to 'Retry' a certain number of times after members are defeated. The first team who drops to 0 in the 'Retry' count loses the game.

Bandai Namco Games

Score Battle

This is a 4-on-4 battle. To reach the highest score possible, each team has to knockout as many people as possible from the other team in a certain amount of time.

Battle Royal

This is a free-for-all, where every man is for himself. Each player will have to knockout the other and reach the highest score possible. All 8 players will battle for the same and unique crown.

Dragon Ball Grab

2 teams of 4 players will fight for the 7 Dragon Balls dispersed in the field. The first team who collects all of the Dragon Balls wins the game. If neither team manages to do that in the allotted time, the one having the highest number wins.

This mode only allows Internet or ad-hoc connection.

Dragon Ball

Character customization

Battle of Z brings back the feature to edit a character to make them the strongest character. It is shown that cards and card slots are the method for editing characters. Battle of Z introduces the feature to edit the color pattern of character's costume.

Reception(edit)

Reception

Aggregate scoreAggregatorScoreMetacritic(PS3): 54/100(6) (PSV): 66/100(7) (X360): 53/100(8)Review scoresPublicationScoreFamitsu32/40(9)GameRevolution(PS3): (11)GameSpot4/10(12)GamesRadar+(10)IGN6.6/10(13)HobbyConsolas80%(14)Slant Magazine(15)3DJuegos 6/10(16)Atomix(X360): 50/100(17)Vandal5/10(18)

Dbz Battle Of Z Ps Vita

Dragon Ball Z: Battle of Z received mixed reviews, The Japanese magazine Famitsu gave 32/40 to all versions of the game with all four reviewers giving the game 8/10. PSU gave it 8/10, criticising the lack of offline vs. and offline co-op modes. IGN gave an overall score of 6.6/10, criticising the limited combat and the unbalanced teams in Battle Mode, while praising the visuals and the Co-op Mode. GameSpot gave this game a 4/10.

As of March 31, 2014 the game shipped 620,000 copies worldwide.(19)

Artdink

References(edit)

^Romano, Sal. 'Dragon Ball Z: Battle of Z announced for PS3, Xbox 360, PS Vita'. Gematsu. Retrieved 20 June 2013.

^'Dragon Ball Z: Battle of Z Makes Super Saiyan God Playable'. 19 June 2013. Retrieved 30 December 2016.

^ abcV-Jump Issue #8, 2013

^ abcWeekly Shōnen Jump, Issue #31, 2013

^'Tales Studio shut down by Namco Bandai'. Retrieved 30 December 2016.

^'Dragon Ball Z: Battle of Z for PlayStation 3 Reviews'. Metacritic. Retrieved February 14, 2020.

^'Dragon Ball Z: Battle of Z for PlayStation Vita Reviews'. Metacritic. Retrieved February 14, 2020.

^'Dragon Ball Z: Battle of Z for Xbox 360 Reviews'. Metacritic. Retrieved February 14, 2020.

^'Fami通評測《龍珠：超宇宙》劣作'. HKGameNEWS.com. January 28, 2015. Retrieved February 14, 2020.

^Saldana, Giancarlo (February 4, 2014). 'DRAGON BALL Z: BATTLE OF Z REVIEW'. GamesRadar. Retrieved February 14, 2020.

^Schaller, Kevin (February 12, 2014). 'Dragon Ball Z: Battle of Z Review'. Game Revolution. Retrieved February 14, 2020.

^Kemps, Heidi (March 12, 2014). 'Dragon Ball Z: Battle of Z Review'. GameSpot. Retrieved February 14, 2020.

^Magee, Jake (February 5, 2014). 'Dragon Ball Z: Battle of Z Review'. IGN. Retrieved February 14, 2020.

^Valdivia, Thais (January 24, 2014). 'Análisis de Dragon Ball Z: Battle of Z'. HobbyConsolas. Retrieved February 14, 2020.

^LeChevallier, Mike (February 3, 2014). 'Review: Dragon Ball Z: Battle of Z'. Slant Magazine. Retrieved February 14, 2020.

^Bella, Jesús (January 24, 2014). 'Análisis de Dragon Ball Z Battle of Z. Kamehameha cooperativo'. 3DJuegos. Retrieved February 14, 2020.

^'Review – Dragon Ball Z: Battle of Z'. Atomix. January 29, 2014. Retrieved February 14, 2020.

^Leiva, Carlos (January 24, 2014). 'Análisis de Dragon Ball Z: Battle of Z (PS3, PSVITA, Xbox 360)'. Vandal. Retrieved February 14, 2020.

^'Financial Highlights for the Fiscal Year Ended March 2014'(PDF). Namco Bandai. 8 May 2014. Retrieved 8 May 2014.

Notes(edit)

^Released under the Bandai brand name outside North America.

External links(edit)

Retrieved from 'https://en.wikipedia.org/w/index.php?title=Dragon_Ball_Z:_Battle_of_Z&oldid=973388070'

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karonbill · 3 years ago

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Administration of Veritas NetBackup 8.0 VCS-276 Exam Questions

Are you worried about your VCS-276 Administration of Veritas NetBackup 8.0 exam? Now you can take your Veritas Certified Specialist VCS-276 exam confidently and pass it with excellent marks. PassQuestion provides high quality Administration of Veritas NetBackup 8.0 VCS-276 Exam Questions for your best preparation. Administration of Veritas NetBackup 8.0 VCS-276 Exam Questions cover all the questions that you will face in the Exam Center. It covers the latest pattern and topics that are used in Real Test. Passing VCS-276 exam with good marks and improvement of knowledge is also achieved.

VCS-276: Administration of Veritas NetBackup 8.0

Administration of Veritas NetBackup 8.0 exam validate that the successful candidate has knowledge and skills necessary to configure and maintain NetBackup version 8.0. Passing this exam will result in a Veritas Certified Specialist (VCS) certification and counts towards the requirements for a Veritas Certified Professional (VCP) certification in Data Protection.

Exam Details

Number of Questions: 65 - 75 Exam Duration: 90 minutes Passing Score: 68% Languages: English Exam Price: $225 USD

Exam ObjectivesEXAM AREA 1 Configure NetBackup 8.0

101: Describe how to configure various master/media/client settings and host properties using the NetBackup administration console. 102: Describe how to configure removable media (tape), volume pools, volume groups, and media manager storage units 103: Describe how to configure disk and cloud storage, storage units, and storage unit groups. 104: Describe how to configure and utilize backup policies. 105: Explain how to implement specialized backup solutions including synthetic backups, True Image Restore (TIR), multiple data streams, checkpoint restart, and the use of backup duplication solutions such as disk staging, Storage Lifecycle Policies, Auto Image Replication, and NetBackup Accelerator. 106: Describe the function, uses, configuration, and administration of the NetBackup deduplication options, such as media server deduplication, client-side deduplication, optimized duplication, and storage servers. 107: Describe how to perform catalog backup configuration tasks.

EXAM AREA 2 Monitor and Maintain NetBackup 8.0

201: Describe how to manage tape devices and tape media. 202: Describe image management concepts and how to use the NetBackup administration console to verify, expire, import, and manually duplicate backup images. 203: Describe how to manage NetBackup disk and cloud storage. 204: Interpret available reports to verify and monitor NetBackup. 205: Describe how and when to prioritize, cancel, suspend, resume, restart, retry or manually run backup and duplication jobs. 206: Describe how to initiate, prioritize, and monitor NetBackup restore jobs.

EXAM AREA 3 Tune NetBackup 8.0

301: Analyze, optimize, and tune NetBackup

EXAM AREA 4 Troubleshoot NetBackup 8.0

401: Interpret status codes and job details in order to diagnose and troubleshoot failed jobs 402: Troubleshoot devices and media, including connectivity between master, media, and client. 403: Troubleshoot common issues related to NetBackup disaster recovery including recovering the NetBackup catalog.

View Online Administration of Veritas NetBackup 8.0 VCS-276 Free Questions

An administrator needs to prevent users on all client systems from performing user-directed restores while ensuring they are able to view the contents of all previous backup images. What should the administrator configure to accomplish this goal? A. enable the Master Server Host Property - Browse timeframe for restores B. enable the Master Server Host Property for clients listed in the Client Attribute - Allow browse C. de-select the "Allow server file writes" parameter in the Host Properties of the Master Server D. de-select the "Allow client restore" parameter in the Host Properties of the Master Server Answer : D

Which two storage unit types can be configured in NetBackup? (Select two.) A. deduplication B. NDMP C. robot D. media manager E. tape Answer : B,D

Storage life-cycle policy SLP1 is used to perform a backup and duplication. The backup is always a small 100MB backup. The master server host properties for SLP Parameters are set to the default values. How can the administrator ensure the duplications run as soon as possible after the backup completes? A. reduce the Job submission Interval setting to 0 B. reduce the Minimum size per duplication job setting to 50MB C. right-click SLP1 and select Manual Relocation to Final Destination D. increase the priority for secondary operations in the SLP Answer : D

An administrator needs to store secure tape copies of protected data to an offsite location. How can the administrator automatically eject tape media daily and create detailed reports? A. encrypt the tapes using software encryption and use a storage lifecycle policy to perform automatic ejects and create reports B. enable the encryption attribute on the vault policy to perform automated ejects and create reports C. use tape drives that support hardware encryption and use a vault policy to perform automated ejects and create reports D. use tape drives that support hardware encryption and use a storage lifecycle policy to perform automated ejects and create reports Answer : C

Which value under Storage Unit Properties reflects the total amount of space allocated to a basic disk storage unit? A. Usable size B. Capacity C. Raw size D. Available or Available space Answer : B

The MSDP catalog on a Media Server has become corrupted. Which two methods are available to bring the MSDP pool back online? (Select two.) A. restore the MSDP catalog from the NetBackup catalog backup B. recover the MSDP catalog from the MSDP catalog backup C. repair the MSDP catalog using the crchk tool D. restore the MSDP catalog from an MSDP catalogshadow copy E. repair the MSDP catalog using the recoverCR tool Answer : B,D

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foxgraphics325 · 3 years ago

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Unix Regex Cheat Sheet

Grep Regex Cheat Sheet

Perl Regex Cheat Sheet Pdf

Unix Regex Cheat Sheet Download

Unix Regex Cheat Sheet Example

A regular expression, regex or regexp is a sequence of characters that define a search pattern. Usually such patterns are used by string searching algorithms for 'find' or 'find and replace' operations on strings, or for input validation.

Cheat Sheet This cheat sheet is intended to be a quick reminder for the main concepts involved in using regular expressions and assumes you already understand their usage. If you are new to regular expressions we strongly suggest you work through the Regular Expressions tutorial from the beginning.

Regular Expressions Cheat Sheet by DaveChild - Cheatography.com Created Date: 4237Z. Name Command; Insert string to the begining of lines: sed -i 's/^/head /g' my-file: Insert string to the end of lines: sed -i 's/$/ tail/g' my-file: Add content after nth line.

characters — what to seek

ring matches ring, springboard, ringtone, etc.

. matches almost any character

h.o matches hoo, h2o, h/o, etc.

Use to search for these special characters:

( ^ $ . | ? * + ( ) ( )

ring? matches ring?

(quiet) matches (quiet)

c:windows matches c:windows

alternatives — | (OR)

cat|dog match cat or dog

order matters if short alternative is part of longer

id|identity matches id or identity

regex engine is 'eager', stops comparing as soon as 1st alternative matches

identity|id matches id or identity

order longer to shorter when alternatives overlap

(To match whole words, see scope and groups.)

character classes — (allowed) or (^NOT allowed)

(aeiou) match any vowel

(^aeiou) match a NON vowel

r(iau)ng match ring, wrangle, sprung, etc.

gr(ae)y match gray or grey

(a-zA-Z0-9) match any letter or digit

(In ( ) always escape . ) and sometimes ^ - .)

shorthand classes

w 'word' character (letter, digit, or underscore)

d digit

s whitespace (space, tab, vtab, newline)

W, D, or S, (NOT word, digit, or whitespace)

(DS) means not digit OR whitespace, both match

(^ds) disallow digit AND whitespace

occurrences — ? * + (n) (n,) (n,n)

? 0 or 1

colou?r match color or colour

* 0 or more

(BW)ill(ieamy's)* match Bill, Willy, William's etc.

+ 1 or more

(a-zA-Z)+ match 1 or more letters

(n) require n occurrences

d(3)-d(2)-d(4) match a SSN

(n,) require n or more

(a-zA-Z)(2,) 2 or more letters

Deezer ariana grande. Ariana Grande 10257966 fans Grammy winning, multi-platinum recording artist and international superstar, Ariana Grande, is the first artist to achieve the top three Billboard Hot 100 spots since The Beatles in 1964 with “7 Rings,” “Break Up With Your Girlfriend, I'm Bored,” and “Thank U, Next.”. Ariana Grande 10270075 fans Grammy winning, multi-platinum recording artist and international superstar, Ariana Grande, is the first artist to achieve the top three Billboard Hot 100 spots since The Beatles in 1964 with “7 Rings,” “Break Up With Your Girlfriend, I'm Bored,” and “Thank U, Next.”.

(n,m) require n - m

(a-z)w(1,7) match a UW NetID

* greedy versus *? lazy

* + and (n,) are greedy — match as much as possible

<.+> finds 1 big match in bold

*? +? and (n,)? are lazy — match as little as possible

<.+?> finds 2 matches in bold

comments — (?#comment)

(?#year)(19|20)dd embedded comment

(?x)(19|20)dd #year free spacing & EOL comment

(see modifiers)

scope — b B ^ $

b 'word' edge (next to non 'word' character)

bring word starts with 'ring', ex ringtone

ringb word ends with 'ring', ex spring

b9b match single digit 9, not 19, 91, 99, etc.

b(a-zA-Z)(6)b match 6-letter words

B NOT word edge

BringB match springs and wringer Body model sketch.

^ start of string $ end of string

^d*$ entire string must be digits

^(a-zA-Z)(4,20)$ string must have 4-20 letters

^(A-Z) string must begin with capital letter

(.!?'))$ string must end with terminal puncutation

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groups — ( )

(in|out)put match input or output

d(5)(-d(4))? US zip code ('+ 4' optional)

Locate all PHP input variables:

NB: parser tries EACH alternative if match fails after group. Can lead to catastrophic backtracking.

back references — n

each ( ) creates a numbered 'back reference'

(to) (be) or not 1 2 match to be or not to be

((^s))1(2) match non-space, then same twice more aaa, ..

b(w+)s+1b match doubled words

non-capturing group — (?: ) prevent back reference

on(?:click|load) is faster than on(click|load)

use non-capturing or atomic groups when possible

atomic groups — (?>a|b) (no capture, no backtrack)

(?>red|green|blue)

faster than non-capturing

alternatives parsed left to right without return

(?>id|identity)b matches id, but not identity

'id' matches, but 'b' fails after atomic group, parser doesn't backtrack into group to retry 'identity'

If alternatives overlap, order longer to shorter.

lookahead — (?= ) (?! ) lookbehind — (?<= ) (?<! )

bw+?(?=ingb) match warbling, string, fishing, ..

b(?!w+ingb)w+b words NOT ending in 'ing'

Grep Regex Cheat Sheet

(?<=bpre).*?b match pretend, present, prefix, ..

bw(3)(?<!pre)w*?b words NOT starting with 'pre'

(lookbehind needs 3 chars, w(3), to compare w/'pre')

bw+(?<!ing)b match words NOT ending in 'ing'

(see LOOKAROUND notes below)

if-then-else — (?ifthen|else)

match 'Mr.' or 'Ms.' if word 'her' is later in string

M(?(?=.*?bherb)s|r). lookahead for word 'her'

(requires lookaround for IF condition)

modifiers — i s m x

ignore case, single-line, multi-line, free spacing

(?i)(a-z)*(?-i) ignore case ON / OFF

(?s).*(?-s) match multiple lines (causes . to match newline)

(?m)^.*;$(?-m)^ & $ match lines not whole string

(?x) #free-spacing mode, this EOL comment ignored

d(3) #3 digits (new line but same pattern)

-d(4) #literal hyphen, then 4 digits

(?-x) (?#free-spacing mode OFF)

/regex/ismx modify mode for entire string

A few examples:

(?s)<p(?(?=s) .*?)>(.*?) span multiple lines

(?s)<p(?(?=s) .*?)>(.*?) locate opening '<p'

(?s)<p(?(?=s) .*?)>(.*?) create an if-then-else

(?s)<p(?(?=s) .*?)>(.*?) lookahead for a whitespace character

(?s)<p(?(?=s) .*?)>(.*?) if found, attempt lazy match of any characters until ..

(?s)<p(?(?=s) .*?)>(.*?) closing angle brace

(?s)<p(?(?=s) .*?)>(.*?) capture lazy match of all characters until ..

(?s)<p(?(?=s) .*?)>(.*?) closing ''

The lookahead prevents matches on PRE, PARAM, and PROGRESS tags by only allowing more characters in the opening tag if P is followed by whitespace. Otherwise, '>' must follow '<p'.

LOOKAROUND notes

(?= ) if you can find ahead

(?! ) if you can NOT find ahead

(?<= ) if you can find behind

(?<! ) if you can NOT find behind

convert Firstname Lastname to Lastname, Firstname (& visa versa)

Pattern below uses lookahead to capture everything up to a space, characters, and a newline. The 2nd capture group collects the characters between the space and the newline. This allows for any number of names/initials prior to lastname, provided lastname is at the end of the line.

Find: (.*)(?= .*n) (.*)n

Repl: 2, 1n — insert 2nd capture (lastname) in front of first capture (all preceding names/initials)

Reverse the conversion.

Find: (.*?), (.*?)n — group 1 gets everything up to ', ' — group 2 gets everything after ', '

Repl: 2 1n

lookaround groups are non-capturing

If you need to capture the characters that match the lookaround condition, you can insert a capture group inside the lookaround.

(?=(sometext)) the inner () captures the lookahead

This would NOT work: ((?=sometext)) Because lookaround groups are zero-width, the outer () capture nothing.

lookaround groups are zero-width

They establish a condition for a match, but are not part of it.

Compare these patterns: re?d vs r(?=e)d

re?d — match an 'r', an optional 'e', then 'd' — matches red or rd

r(?=e)d — match 'r' (IF FOLLOWED BY 'e') then see if 'd' comes after 'r'

Perl Regex Cheat Sheet Pdf

The lookahead seeks 'e' only for the sake of matching 'r'.

Because the lookahead condition is ZERO-width, the expression is logically impossible.

It requires the 2nd character to be both 'e' and 'd'.

For looking ahead, 'e' must follow 'r'.

For matching, 'd' must follow 'r'.

fixed-width lookbehind

Most regex engines depend on knowing the width of lookbehind patterns. Ex: (?<=h1) or (?<=w(4)) look behind for 'h1' or for 4 'word' characters.

This limits lookbehind patterns when matching HTML tags, since the width of tag names and their potential attributes can't be known in advance.

variable-width lookbehind

.NET and JGSoft support variable-width lookbehind patterns. Ex: (?<=w+) look behind for 1 or more word characters. The first few examples below rely on this ability.

Lookaround groups define the context for a match. Here, we're seeking .* ie., 0 or more characters. A positive lookbehind group (?<= . . . ) preceeds. A positive lookahead group (?= . . . ) follows. These set the boundaries of the match this way:

(?<=<(w+)>).*(?=</1>) look behind current location

(?<=<(w+)>).*(?=</1>) for < > surrounding ..

(?<=<(w+)>).*(?=</1>) one or more 'word' characters. The ( ) create a capture group to preserve the name of the presumed tag: DIV, H1, P, A, etc.

(?<=<(w+)>).*(?=</1>) match anything until

(?<=<(w+)>).*(?=</1>) looking ahead from the current character

(?<=<(w+)>).*(?=</1>) these characters surround

(?<=<(w+)>).*(?=</1>) the contents of the first capture group

In other words, advance along string until an opening HTML tag preceeds. Match chars until its closing HTML tag follows. The tags themselves are not matched, only the text between them.

Unix Regex Cheat Sheet Download

To span multiple lines, use the (?s) modifier. (?s)(?<=<cite>).*(?=</cite>) Match <cite> tag contents, regardless of line breaks.

As in example above, the first group (w+) captures the presumed tag name, then an optional space and other characters ?.*? allow for attributes before the closing >.

class='.*?bredb.*?' this new part looks for class=' and red and ' somewhere in the opening tag

b ensures 'red' is a single word

.*? allow for other characters on either side of 'red' so pattern matches class='red' and class='blue red green' etc.

Here, the first group captures only the tag name. The tag's potential attributes are outside the group.

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> set ignore case ON

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> find an opening tag by matching 1 letter after <

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> then match 0 or more letters or digits

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> make this tag a capture group

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> match 0 or more characters that aren't > — this allows attributes in opening tag

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> match the presumed end of the opening tag

(NB: This markup <a> would end the match early. Doesn't matter here. Subsequent < pulls match to closing tag. But if you attempted to match only the opening tag, it might be truncated in rare cases.)

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> lazy match of all of tag's contents

(?i)<((a-z)(a-z0-9)*)(^>)*>.*?</1> match the closing tag — 1 refers to first capture group

The IF condition can be set by a backreference (as here) or by a lookaround group.

(()?d(3) optional group ( )? matches '(' prior to 3-digit area code d(3) — group creates back reference #1

(?(1)) ?|(-/ .)) (1) refers to group 1, so if '(' exists, match ')' followed by optional space, else match one of these: '- / . '

d(3)(- .)d(4) rest of phone number

Unix Regex Cheat Sheet Example

For a quick overview: http://www.codeproject.com/KB/dotnet/regextutorial.aspx.

For a good tutorial: http://www.regular-expressions.info.

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toknowmore · 3 years ago

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Presently like never before, associations approach a lot of information that can be utilized for their potential benefit. This period of large information and examination has permitted dealers to settle on more key and educated operational choices. Be that as it may, the space of installments has frequently been sidelined in the streamlining of information. While putting resources into examination for regions, for example, advertising is more normal, one ought not belittle the possible effect of installment information and bits of knowledge. Given the development in online exchanges, this moment is the ideal opportunity to figure out how to use inside and out detailing highlights for online installments. This will empower dealers to essentially diminish their expenses as well as produce higher incomes. Allow us to investigate how this is accomplished.

Client conduct One manner by which traders can build their income is by better obliging their clients. To do this, they need to have perceivability on their clients' shopping designs, featuring the regions that require improvement. By knowing the clients' exchanges history, the nation they're from, installment techniques and monetary forms they execute in, how regularly they shop and what their normal exchange esteem is, traders can measure their clients' inclinations and conduct. This gives them a superior comprehension of installment techniques and highlights they should offer to help changes and lessen truck quitters. Singular client profiling should likewise be possible utilizing each client's record subtleties and gadgets plotted against different clients on a strong interconnected client personality diagram. This permits one to perceive and separate ordinary steadfast clients from the rest, break down these client sections and offer them client unwaveringness rewards. On account of clients who are not dynamic any longer as seen with a decrease in their exchanges, traders may likewise think that its advantageous to offer them designated advancements. There is additionally much more that should be possible with the stashes of experiences acquired from such a chart. In the event that one trusts in the well-known adage "Client is King", the requirement for such an examination arrangement is very clear. Acquirer wellbeing check Vendors with a Multi-acquirer arrangement can significantly profit with bits of knowledge on the entirety of their acquirers. It's imperative to collaborate with an installment stage that can make a solidified dashboard utilizing a huge number of data like the acquirer's foundation wellbeing, execution, and noteworthy history. A wellbeing check of such kind would incorporate every acquirer's prosperity rate, purposes behind fruitless exchanges, money based change rates, and simple to-explore dissemination diagrams for something similar. At the point when an acquirer is working in numerous monetary standards, their transformation rates for every money may fluctuate. For example, an acquirer may perform preferred in USD over they do in EUR. These experiences empower dealers to add or take away various monetary standards from acquirers and thus, upgrade their exchange achievement rates. As consistently calls for new exchanges and insights on the equivalent, it is observational for shippers to monitor the progressions in information and change their installment methodologies in like manner. On the off chance that a trader detects an example of ineffective exchanges, this may demonstrate a halfway or full blackout on the acquirers' end. For this situation, one can utilize falling where failover exchanges are consequently shipped off an optional gaining bank. When settling on acquirers, shippers are presently ready to arrange savvy exchange steering (ITR). ITR has been known to advance the steering of exchanges while permitting the expense effective progression of business tasks. Peruse more regarding this matter in our blog: What you should think about Intelligent exchange steering Experiences into singular exchanges Other than the previously mentioned investigation, conditional information can likewise be used on a more granular scale. The information followed incorporates the beginning of every exchange, how frequently the client retried the installment, and why it fizzled. This guarantees that information on a total level or in compromise reports are effectively detectable, adding to information quality. Also, having broad conditional information for each and every installment can extraordinarily improve traders' client support capacities. For example, if a client documented a grumbling identified with the acquisition of an item, the trader could without much of a stretch check the exchange being referred to and recognize the issue, speedily adjusting the client and tackling their objection. Additionally, in the event of a bombed installment, a shipper could use singular exchange information to quickly check the mistake and send the client an alternate installment choice, for example, pay-by-connection or QR-code installment, at last upgrading consumer loyalty. Webstore examination Finally, it is critical to bring up that installment examination ought not be an independent usefulness, but instead incorporated with the remainder of the webstore's investigation, like Google Analytics. This can expand the value of information by permitting vendors to see new associations, examples, and experiences from the entire client venture. The accumulation of installments and webstore examination additionally implies that traders don't have to sign in at various places and endeavor to coordinate with information or battle to extricate some important data from isolated information records. All things considered, they can see the entire client venture on one dashboard with all the data merged progressively. Subsequently, incorporating webstore investigation with installment information works on the information examination measure and gives a total perspective on the customer. Plainly, there is no seriously cutting and dicing of information! Conclusion It is protected to say, banding together with an installment stage that effectively totals and cycles information while at the same time giving significant ongoing examination, is the best approach. Such experiences would then be able to be utilized to expand the organization's everyday proficiency and coherence. It engages senior administration to all the more likely comprehend the regions that need their consideration. Alongside this, directing data empowers the simple location of issues and assists one with setting key steering rules for future arranging. Having definite exchange data across all channels and geologies additionally permits dealers to perceive and anticipate installment patterns while growing abroad. Generally speaking such an answer is a significant resource with regards to momentary dynamic and business examination for the shippers. At WLPayments we offer an assortment of top to bottom revealing highlights that you can investigate.

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this-week-in-rust · 2 years ago

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This Week in Rust 470

Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tag us at @ThisWeekInRust on Twitter or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

Official

Async fn in trait MVP comes to nightly

Foundation

Community Grantee Spotlight: Sebastian Thiel

Project/Tooling Updates

rust-analyzer changelog #156

IntelliJ Rust Changelog #183

Fornjot (code-first CAD in Rust) - Weekly Release

This Week in Fyrox #3

futures-concurrency Release v7.0.0

Rust Search Extension v1.9.0 has been released

[Chinese] RustSBI 0.3.0 Has Released

[Chinese] Video: Technologies and Applications in RustSBI 0.3.0

Observations/Thoughts

A Better Way to Borrow in Rust: Stack Tokens

Category Theory with Rust (pt1)

If a Tree Falls in a Forest, Does It Overflow the Stack?

Safely writing code that isn't thread-safe

Embedded Rust & Embassy: GPIO Button Controlled Blinking

[video] Panel: Rust in reality - EuroRust 2022

Rust Walkthroughs

Calling Rust from iOS

Rust, Lambda, and DynamoDB

Render Pipelines in wgpu and Rust

(Re)writing an interpreter in Rust

Miscellaneous

The carcinization of Go programs

Flux: Refinement Types for Rust

[video] Rust 🤝 WebAssembly with Alex Crichton

[video] Getting Started with Rust: Understanding Rust Compile Errors

[video] Can you use Character Controllers for non-platformer games?

Crate of the Week

This week's crate is graph, a collection of high-performance graph algorithms.

Thanks to Knutwalker for the (partial self-) suggestion!

Please submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but didn't know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

There were no calls for participation submitted this week. If you would like to submit, please check the guidelines.

If you are a Rust project owner and are looking for contributors, please submit tasks here.

Updates from the Rust Project

388 pull requests were merged in the last week

deduce closure signature from a type alias impl Trait's supertraits

pass 128-bit C-style enum enumerator values to LLVM

detect incorrect chaining of if and if let conditions and recover

diagnostics icu4x based list formatting

diagnostics: only show one suggestion for method → assoc fn

fix inconsistent rounding of 0.5 when formatted to 0 decimal places

fix non-associativity of Instant math on aarch64-apple-darwin targets

improve generating Custom entry (as in main()) function

improve spans for RPITIT object-safety errors

interpret: support for per-byte provenance

llvm-wrapper adapt for LLVM API change

nll: correctly deal with bivariance

only do parser recovery on retried macro matching

record LocalDefId in HIR nodes instead of a side table

shift no characters when using raw string literals

slightly improve error message for invalid identifier

support #[track_caller] on async fns

miri: make align_offset always work on no-provenance pointers

miri: stack borrows: weak protectors

add new MIR constant propagation based on dataflow analysis

merge basic blocks where possible when generating LLVM IR

minimal implementation of implicit deref patterns for Strings

shrink ast::Expr harder

use token::Lit in ast::ExprKind::Lit

perform simple scalar replacement of aggregates (SROA) MIR opt

make pointer::byte_offset_from more generic

fix mod_inv termination for the last iteration

improve accuracy of asinh and acosh

stabilize const char convert

VecDeque::resize should re-use the buffer in the passed-in element

unchecked_{shl, shr} should use u32 as the RHS

constify is_aligned via align_offset

x86_64 SSE2 fast-path for str.contains(&str) and short needles

remove HRTB from slice::is_sorted_by(_key)

portable-simd: scatter/gather for pointers

stdarch: fix undefined behavior in movemask_epi8

compiler-builtins: skip assembly implementations on the UEFI targets

compiler-builtins: use a stub stdlib.h when compiling for UEFI targets

cargo: fix cargo install --index when used with registry.default

cargo: alternative registry authentication support (RFC #3139)

cargo: improve error message for cargo add/remove

rustdoc: fix missing minification for static files

rustdoc: resolve doc links in external traits having local impls

clippy: never_loop: don't emit AlwaysBreaks if it targets a block

clippy: add new lint misnamed-getters

clippy: allow manual swap in const fn

clippy: allow return types for closures with lifetime binder

clippy: arithmetic_side_effects: detect overflowing associated constants of integers

clippy: extend needless_borrowed_reference to structs and tuples, ignore _

clippy: lint unchecked subtraction of a 'Duration' from an 'Instant'

clippy: fix #[allow] for module_name_repetitions & single_component_path_imports

clippy: preserve ref on infallible_destructuring_match suggestion

rust-analyzer: allow viewing the full compiler diagnostic in a readonly textview

rust-analyzer: make "Remove dbg!()" assist work on selections

rust-analyzer: remove item_const which had default value when implement missing members

rust-analyzer: format expression parsing edge-cases

rust-analyzer: include generic parameter in GAT completions

rust-analyzer: resolve inference variable before applying adjustments

rust-analyzer: strip comments and attributes off of all trait item completions

rust-analyzer: support multiple targets for checkOnSave (in conjunction with cargo 1.64.0+)

Rust Compiler Performance Triage

A fairly quiet week with regressions unfortunately slightly outweighing improvements. There was not any particular change of much note. Many of the regressions were justifiable since they were for critical bug fixes.

Triage done by @rylev. Revision range: 96ddd32c..a78c9bee

Summary:

(instructions:u) mean range count Regressions ❌ (primary) 0.7% [0.2%, 3.0%] 76 Regressions ❌ (secondary) 1.5% [0.3%, 8.4%] 69 Improvements ✅ (primary) -0.7% [-1.8%, -0.2%] 18 Improvements ✅ (secondary) -1.4% [-3.2%, -0.2%] 35 All ❌✅ (primary) 0.4% [-1.8%, 3.0%] 94

7 Regressions, 4 Improvements, 6 Mixed; 5 of them in rollups 47 artifact comparisons made in total

Full report here

Call for Testing

No RFCs issued a call for testing this week.

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

No RFCs were approved this week.

Final Comment Period

Every week, the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

RFCs

[disposition: merge] Style evolution

Tracking Issues & PRs

[disposition: merge] Expand a style-guide principle: readability in plain text

[disposition: merge] Stabilize native library modifier verbatim

New and Updated RFCs

[new] feature iter_find_many

[new] RFC: UTF-8 characters and escape codes in (byte) string literals

Upcoming Events

Rusty Events between 2022-11-23 - 2022-12-21 🦀

Virtual

2022-11-24 | Virtual (Linz, AT) | Rust Linz

Rust Meetup Linz - 27th Edition

2022-11-28 | Virtual | Rust Formal Methods Interest Group

MiniRust with Ralf Jung

2022-11-29 | Virtual (Dallas, TX, US) | Dallas Rust

Last Tuesday

2022-11-30 | Virtual (Cardiff, UK) | Rust and C++ Cardiff

Common crates and their usage

2022-11-30 | Virtual (Munich, DE) | Rust Munich

Rust Munich 2022 / 3 - hybrid

2022-12-01 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup

Exploring USB with Rust

2022-12-01 | Virtual (Lehi, UT, US) | Utah Rust

Beginner Projects and Shop Talk with Food!

2022-12-01 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond

Getting Started with Rust: Understanding Rust Compile Errors – Part 2

2022-12-06 | Virtual (Berlin, DE) | Berlin.rs

Rust Hack and Learn

2022-12-06 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup

Buffalo Rust User Group, First Tuesdays

2022-12-07 | Virtual (Indianapolis, IN, US) | Indy Rust

Indy.rs - with Social Distancing

2022-12-07 | Virtual (Stuttgart, DE) | Rust Community Stuttgart

Rust-Meetup

2022-12-08 | Virtual (Nürnberg, DE) | Rust Nuremberg

Rust Nürnberg online #20

2022-12-08 | Virtual (San Francisco, CA, US) | Data + AI Online Meetup

D3L2: The Genesis of Delta Rust with QP Hou

2022-12-10 | Virtual | Rust GameDev

Rust GameDev Monthly Meetup

2022-12-13 | Virtual (Rostock, DE) | Altow Academy

Rust Meetup Rostock

2022-12-13 | Virtual (Saarbrücken, DE) | Rust-Saar

Meetup: 25u16

2022-12-14 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust

Monthly Meetup

2022-12-20 | Virtual (Berlin, DE) | Berlin.rs

Rust Hack and Learn

2022-12-20 | Virtual (Washington, DC, US) | Rust DC

Mid-month Rustful

2022-12-21 | Virtual (Vancouver, BC, CA) | Vancouver Rust

Rust Study/Hack/Hang-out

Europe

2022-11-23 | Bratislava, SK | Bratislava Rust Meetup Group

Initial Meet and Greet Rust meetup

2022-11-24 | København, DK | Copenhagen Rust Group

Hack Night #31

2022-11-28 | London, UK | Rust London User Group

Rust London Code Dojo: Rust with Front-End Web Assembly

2022-11-30 | Amsterdam, NL | Rust Nederland

Rust in Critical Infrastructure

2022-11-30 | Lille, FR | Rust Lille

Rust Lille #1

2022-11-30 | Milan, IT | Rust Language Milano

Welcome GAT!!

2022-11-30 | Paris, FR | Rust Paris

Rust Paris meetup #54

2022-11-30 | Munich, DE + Virtual | Rust Munich

Rust Munich 2022 / 3 - hybrid

2022-12-01 | Edinburgh, UK | Rust Edinburgh

December Talks + Rust Book Raffle

2022-12-01 | Wrocław, PL | Rust Wrocław

Rust Wrocław Meetup #30

2022-12-07 | Zurich, CH | Rust Zurich

Next generation i18n with rust (icu4x) and zero-copy deserialization

2022-12-12 | Enschede, NL | Dutch Rust Meetup

Rust Meetup - Subject TBA

North America

2022-11-29 | Austin, TX, US | ATX Rustaceans

Atx Rustaceans Meetup

2022-12-01 | Lehi, UT, US + Virtual | Utah Rust

Beginner Projects and Shop Talk with Food!

2022-12-08 | Columbus, OH, US | Columbus Rust Society

Monthly Meeting

2022-12-20 | San Francisco, CA, US | San Francisco Rust Study Group

Rust Hacking in Person

Oceania

2022-11-24 | Brisbane, QLD, AU | Rust Brisbane

November Meetup

2022-12-08 | Melbourne, VIC, AU | Rust Melbourne

December 2022 Meetup

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

While working on these userspace Mesa changes today, I did not hit a single GPU kernel driver bug. Not. A. Single. Bug.

This is thanks to Lina's phenomenal efforts. She took a gamble writing the kernel driver in Rust, knowing it would take longer to get to the first triangle but believing it would make for a more robust driver in the end. She was right.

A few months of Lina's Rust development has produced a more stable driver than years of development in C on certain mainline Linux GPU kernel drivers.

I think... I think I have Rust envy 🦀

....Or maybe just Lina envy 😊

– Alyssa Rosenzweig tooting on Mastodon

Thanks to Brian Kung for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin, bennyvasquez.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

#rust-lang #rust #rustlang #twir #long post

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qwertsypage · 5 years ago

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Mastering Async Await in Node.js

In this article, you will learn how you can simplify your callback or Promise based Node.js application with async functions (async/await).

Whether you’ve looked at async/await and promises in javascript before, but haven’t quite mastered them yet, or just need a refresher, this article aims to help you.

A note from the authors:

We re-released our number one article on the blog called "Mastering Async Await in Node.js" which has been read by more than 400.000 developers in the past 3 years.

This staggering 2000 word essay is usually the Nr. 1 result when you Google for Node.js Async/Await info, and for a good reason.

It's full of real-life use cases, code examples, and deep-diving explanations on how to get the most out of async/await. Since it's a re-release, we fully updated it with new code examples, as there are a lot of new Node.js features since the original release which you can take advantage of.

What are async functions in Node?

Async functions are available natively in Node and are denoted by the async keyword in their declaration. They always return a promise, even if you don’t explicitly write them to do so. Also, the await keyword is only available inside async functions at the moment - it cannot be used in the global scope.

In an async function, you can await any Promise or catch its rejection cause.

So if you had some logic implemented with promises:

You can make it look like synchronous code using async/await:

async function handler (req, res) { let response; try { response = await request('https://user-handler-service') ; } catch (err) { logger.error('Http error', err); return res.status(500).send(); } let document; try { document = await Mongo.findOne({ user: response.body.user }); } catch (err) { logger.error('Mongo error', err); return res.status(500).send(); } executeLogic(document, req, res); }

Currently in Node you get a warning about unhandled promise rejections, so you don’t necessarily need to bother with creating a listener. However, it is recommended to crash your app in this case as when you don’t handle an error, your app is in an unknown state. This can be done either by using the --unhandled-rejections=strict CLI flag, or by implementing something like this:

process.on('unhandledRejection', (err) => { console.error(err); process.exit(1); })

Automatic process exit will be added in a future Node release - preparing your code ahead of time for this is not a lot of effort, but will mean that you don’t have to worry about it when you next wish to update versions.

Patterns with async functions

There are quite a couple of use cases when the ability to handle asynchronous operations as if they were synchronous comes very handy, as solving them with Promises or callbacks requires the use of complex patterns.

Since [email protected], there is support for async iterators and the related for-await-of loop. These come in handy when the actual values we iterate over, and the end state of the iteration, are not known by the time the iterator method returns - mostly when working with streams. Aside from streams, there are not a lot of constructs that have the async iterator implemented natively, so we’ll cover them in another post.

Retry with exponential backoff

Implementing retry logic was pretty clumsy with Promises:

This would get the job done, but we can rewrite it with async/await and make it a lot more simple.

A lot more pleasing to the eye isn't it?

Intermediate values

Not as hideous as the previous example, but if you have a case where 3 asynchronous functions depend on each other the following way, then you have to choose from several ugly solutions.

functionA returns a Promise, then functionB needs that value and functionC needs the resolved value of both functionA's and functionB's Promise.

Solution 1: The .then Christmas tree

function executeAsyncTask () { return functionA() .then((valueA) => { return functionB(valueA) .then((valueB) => { return functionC(valueA, valueB) }) }) }

With this solution, we get valueA from the surrounding closure of the 3rd then and valueB as the value the previous Promise resolves to. We cannot flatten out the Christmas tree as we would lose the closure and valueA would be unavailable for functionC.

Solution 2: Moving to a higher scope

function executeAsyncTask () { let valueA return functionA() .then((v) => { valueA = v return functionB(valueA) }) .then((valueB) => { return functionC(valueA, valueB) }) }

In the Christmas tree, we used a higher scope to make valueA available as well. This case works similarly, but now we created the variable valueA outside the scope of the .then-s, so we can assign the value of the first resolved Promise to it.

This one definitely works, flattens the .then chain and is semantically correct. However, it also opens up ways for new bugs in case the variable name valueA is used elsewhere in the function. We also need to use two names — valueA and v — for the same value.

Are you looking for help with enterprise-grade Node.js Development? Hire the Node developers of RisingStack!

Solution 3: The unnecessary array

function executeAsyncTask () { return functionA() .then(valueA => { return Promise.all([valueA, functionB(valueA)]) }) .then(([valueA, valueB]) => { return functionC(valueA, valueB) }) }

There is no other reason for valueA to be passed on in an array together with the Promise functionB then to be able to flatten the tree. They might be of completely different types, so there is a high probability of them not belonging to an array at all.

Solution 4: Write a helper function

const converge = (...promises) => (...args) => { let [head, ...tail] = promises if (tail.length) { return head(...args) .then((value) => converge(...tail)(...args.concat([value]))) } else { return head(...args) } } functionA(2) .then((valueA) => converge(functionB, functionC)(valueA))

You can, of course, write a helper function to hide away the context juggling, but it is quite difficult to read, and may not be straightforward to understand for those who are not well versed in functional magic.

By using async/await our problems are magically gone:

async function executeAsyncTask () { const valueA = await functionA(); const valueB = await functionB(valueA); return function3(valueA, valueB); }

Multiple parallel requests with async/await

This is similar to the previous one. In case you want to execute several asynchronous tasks at once and then use their values at different places, you can do it easily with async/await:

async function executeParallelAsyncTasks () { const [ valueA, valueB, valueC ] = await Promise.all([ functionA(), functionB(), functionC() ]); doSomethingWith(valueA); doSomethingElseWith(valueB); doAnotherThingWith(valueC); }

As we've seen in the previous example, we would either need to move these values into a higher scope or create a non-semantic array to pass these values on.

Array iteration methods

You can use map, filter and reduce with async functions, although they behave pretty unintuitively. Try guessing what the following scripts will print to the console:

map

filter

reduce

Solutions:

[ Promise { <pending> }, Promise { <pending> }, Promise { <pending> }, Promise { <pending> } ]

[ 1, 2, 3, 4 ]

If you log the returned values of the iteratee with map you will see the array we expect: [ 2, 4, 6, 8 ]. The only problem is that each value is wrapped in a Promise by the AsyncFunction.

So if you want to get your values, you'll need to unwrap them by passing the returned array to a Promise.all:

main() .then(v => Promise.all(v)) .then(v => console.log(v)) .catch(err => console.error(err));

Originally, you would first wait for all your promises to resolve and then map over the values:

function main () { return Promise.all([1,2,3,4].map((value) => asyncThing(value))); } main() .then(values => values.map((value) => value * 2)) .then(v => console.log(v)) .catch(err => console.error(err));

This seems a bit more simple, doesn’t it?

The async/await version can still be useful if you have some long running synchronous logic in your iteratee and another long-running async task.

This way you can start calculating as soon as you have the first value - you don't have to wait for all the Promises to be resolved to run your computations. Even though the results will still be wrapped in Promises, those are resolved a lot faster then if you did it the sequential way.

What about filter? Something is clearly wrong...

Well, you guessed it: even though the returned values are [ false, true, false, true ], they will be wrapped in promises, which are truthy, so you'll get back all the values from the original array. Unfortunately, all you can do to fix this is to resolve all the values and then filter them.

Reducing is pretty straightforward. Bear in mind though that you need to wrap the initial value into Promise.resolve, as the returned accumulator will be wrapped as well and has to be await-ed.

.. As it is pretty clearly intended to be used for imperative code styles.

To make your .then chains more "pure" looking, you can use Ramda's pipeP and composeP functions.

Rewriting callback-based Node.js applications

Async functions return a Promise by default, so you can rewrite any callback based function to use Promises, then await their resolution. You can use the util.promisify function in Node.js to turn callback-based functions to return a Promise-based ones.

Rewriting Promise-based applications

Simple .then chains can be upgraded in a pretty straightforward way, so you can move to using async/await right away.

function asyncTask () { return functionA() .then((valueA) => functionB(valueA)) .then((valueB) => functionC(valueB)) .then((valueC) => functionD(valueC)) .catch((err) => logger.error(err)) }

will turn into

async function asyncTask () { try { const valueA = await functionA(); const valueB = await functionB(valueA); const valueC = await functionC(valueB); return await functionD(valueC); } catch (err) { logger.error(err); } }

Rewriting Node.js apps with async/await

If you liked the good old concepts of if-else conditionals and for/while loops,

if you believe that a try-catch block is the way errors are meant to be handled,

you will have a great time rewriting your services using async/await.

As we have seen, it can make several patterns a lot easier to code and read, so it is definitely more suitable in several cases than Promise.then() chains. However, if you are caught up in the functional programming craze of the past years, you might wanna pass on this language feature.

Are you already using async/await in production, or you plan on never touching it? Let's discuss it in the comments below.

Are you looking for help with enterprise-grade Node.js Development? Hire the Node developers of RisingStack!

This article was originally written by Tamas Kadlecsik and was released on 2017 July 5. The heavily revised second edition was authored by Janos Kubisch and Tamas Kadlecsik, and it was released on 2020 February 17.

Mastering Async Await in Node.js from node

Mastering Async Await in Node.js published first on https://koresolpage.tumblr.com/

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t-baba · 5 years ago

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The 2019 State of JavaScript survey is here

#465 — November 29, 2019

Read on the Web

JavaScript Weekly

▶ Faster JavaScript Apps with JSON.parse() — Did you know that JSON can be parsed more quickly than JavaScript itself? Here's how and why to consider using JSON.parse instead of normal object literals.

Mathias Bynens / Bram van Damme

It's Time to Take the State of JavaScript 2019 Survey — Now in its fourth year, the popular State of JavaScript survey returns, seeking your responses to help find out “which libraries developers want to learn next, which have the best satisfaction ratings, and much more”. Of course, we’ll share the results once they’re live, as always.

Raphaël Benitte, Sacha Greif and Michael Rambeau

Getting Started Building Apps with JavaScript — CascadiaJS just wrapped up. Take a look at the collection of articles, tutorials and podcast episodes that will help you get started building web applications with JavaScript and JS-related technologies.

Heroku sponsor

ESLint 6.7 Released — The popular linting tool includes a new way for rule authors to make suggestions for non-automatic fixes, plus there are six new rules covering things like duplicate else-ifs and grouping accessor pairs. 6.7.1 quickly followed 6.7.0 fixing a regression.

ESLint

Cockatiel: A Resilience and Transient-Fault-Handling Library — This is for defining common resilience or fault handling techniques like ‘backoff’, retries, circuit breakers, timeouts, etc. and is inspired by .NET’s Polly fault handling library.

Connor Peet

The Epic List of Languages That Compile to JavaScript — JavaScript is as much a compile target as a language in its own right these days, and this extensive list on the CoffeeScript repo has been (and continues to be) updated for years. The latest addition? Fengari, a Lua VM written in JavaScript.

Jeremy Ashkenas et al.

▶ Building Promises From Scratch in a Post-Apocalyptic Future — A 20 minute screencast covering what’s involved in creating a promises implementation from scratch on top of lower level primitives (e.g. callbacks).

Low Level JavaScript

⚡️ Quick Releases

Babel 7.7.4 — The JavaScript transpiler.

Ink 2.6.0 — Like React but for building CLI apps.

GPU.js 2.3.0 — GPU-accelerated JavaScript.

jQuery.Terminal 2.9.0 — Add terminal experiences to your site/app.

💻 Jobs

Senior Front-End Software Engineer (Vue, Nuxt, Apollo) — Join our distributed Front-End functional team in our quest to make doctors more effective using Vue, Nuxt, Apollo and Rails.

Doximity

Vue Front End Lead at Valiant Finance - Sydney, Australia — FinTech based in Surry Hills looking for an experienced Vue Front End Lead to help us build our growing financial marketplace.

Valiant Finance

Find a Job Through Vettery — Make a profile, name your salary, and connect with hiring managers from top employers. Vettery is completely free for job seekers.

Vettery

📘 Articles & Tutorials

An Official Style Guide for Writing Redux Code — Recommended patterns, best practices, and suggested approaches for writing Redux-based apps.

Redux

An Introduction to the Picture-in-Picture Web API — Chrome supports a ‘picture-in-picture’ mechanism for creating floating video windows that continue to play even if a user navigates to a different page. Firefox and Safari have support via proprietary APIs too.

Ayooluwa Isaiah

Black Friday Sale: Quokka.js - Rapid JavaScript Prototyping in Your Editor — Quokka displays execution results in your editor as you type. Get it now with a 50% Black Friday discount.

Wallaby.js sponsor

Understanding Streams in Node.js — Streams continue to be one of the fundamental concepts that power Node applications.

Liz Parody

Outside the Web: Emscripten Now Generating Standalone WebAssembly Binaries — A key part of both asm.js and Emscripten was the idea of compiling binaries for use on the Web using JavaScript, but now Emscripten has support for emitting WebAssembly without relying on JavaScript at all. You can, of course, interact with such output from your JavaScript code, though.

Alon Zakai

Building Animated Draggable Interfaces with Vue.js and Tailwind — Tailwind CSS is an increasingly popular CSS framework.

Cristi Jora

Video Developer Report - Top Trends in Video Technology 2019

Bitmovin sponsor

Using Backreferences in JavaScript Regular Expressions — Backreferences allow you to use matches already made within a regex within that same regex.

stefan judis

For the Sake of Your Event Listeners, Use Web Workers — “Start by identifying notably intense processes and spin up a small Web Worker for them.”

Alex MacArthur

🔧 Code & Tools

litegraph.js: A Graph Node Engine and Editor — This would be useful if you need to create an online system for users to create and manipulate graphs or interconnecting ‘nodes’ for things like graphics, audio or data pipelines, say. Live demo here.

Javi Agenjo

Duktape 2.5: A Compact, Embeddable JavaScript Engine — An ES5.1-compliant JavaScript engine focused on being very compact. If you have a C/C++ project that needs a JS engine, it’s worth a look as the duk binary runs only 350K.

Sami Vaarala

Automate and Standardize Code Reviews for JS and 29 Other Languages — Set standards on coverage, duplication, complexity, and style issues and see real-time feedback in your Git workflow.

Codacy sponsor

Scala.js 1.0.0-RC1: A Scala to JavaScript Compiler — A final 1.0 release is due in early 2020. If this area of using Scala to build front-end apps interests you, you might also like Slinky which makes writing React apps in Scala easier.

Scala Team

Ketting 5.0: A 'Generic' Hypermedia Client for JavaScript — Supports Hypertext Application Language, JSON:API, Siren, and HTTP link headers. Works in both the browser and Node.js.

Evert Pot

WebGLStudio.js: A 3D Graphics Editor in the Browser — It’s not new but its author says it’s now mature, ready to be extended, and can be used in production (although a 1.0 release is still a little way away).

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JSONCrush: Compresses JSON Into URI Friendly Strings — The results are shorter than standard URI encoding.

Frank Force

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for-the-user · 7 years ago

Text

jenkins pipeline idiosyncrasies

window.location.replace("https://blog.sebastianfromearth.com/post/20171024183315");

Some useful resources

PIPELINE SYNTAX GROOVY SYNTAX REFERENCE GROOVY / BASH ESCAPE SEQUENCE RIDICULOUSNESS PIPELINE BEST PRACTICES JENKINS PIPELINE DIRTY SECRETS PART ONE & TWO

Keywords

pipeline (required) - contains the entire Pipeline definition agent (required)- defines the agent used for entire pipeline or a stage any - use any available agent none - do not use a node node - allocate a specific executor label - existing Jenkins node label for agent customWorkspace - use a custom workspace directory on agent docker - requires docker-enabled node image - run inside specified docker image label - existing Jenkins node label for agent registryUrl - use a private registry hosting image registryCredentialsId - id of credentials to connect to registry reuseNode - (Boolean) reuse the workspace and node allocated previously args - arguments for docker container. customWorkspace - use a custom workspace directory on agent dockerfile - use a local dockerfile filename - name of local dockerfile dir - subdirectory to use label - existing Jenkins node label reuseNode - (Boolean) reuse the workspace and node allocated previously args - arguments for docker container customWorkspace - use a custom workspace directory on agent stages (required) - contains all stages and steps within Pipeline stage (required) - specific named “Stage” of the Pipeline steps (required) - build steps that define the actions in the stage. Contains one or more of following: any build step or build wrapper defined in Pipeline. e.g. sh, bat, powershell, timeout, retry, echo, archive, junit, etc. script - execute Scripted Pipeline block when - executes stage conditionally branch - stage runs when branch name matches ant pattern expression - Boolean Groovy expression anyOf - any of the enclosed conditions are true allOf - all of the enclosed conditions are true not - none of the enclosed conditions are true parallel - stage - stages are executed in parallel but agent, environment, tools and post may also optionally be defined in stage environment - a sequence of “key = value” pairs to define environment variables credentials(‘id’) (optional) - Bind credentials to variable. libraries - load shared libraries from an scm lib - the name of the shared library to load options - options for entire Pipeline. skipDefaultCheckout - disable auto checkout scm timeout - sets timeout for entire Pipeline buildDiscarder - discard old builds disableConcurrentBuilds - disable concurrent Pipeline runs ansiColor - color the log file output tools - Installs predefined tools to be available on PATH triggers - triggers to launch Pipeline based on schedule, etc. parameters - parameters that are prompted for at run time. post - defines actions to be taken when pipeline or stage completes based on outcome. Conditions execute in order: always - run regardless of Pipeline status. changed - run if the result of Pipeline has changed from last run success - run if Pipeline is successful unstable - run if Pipeline result is unstable failure - run if the Pipeline has failed

Pass variable from one stage to another

stages { stage("1") { agent any steps { script { my_app_CHANGED = true def SOMETHING = true } echo "${my_app_CHANGED}" // true echo "${SOMETHING}" // true } } stage("2") { agent any steps { script { echo "${my_app_CHANGED}" // true echo "${SOMETHING}" // build will fail here, scope related } } } }

Omitting the "def" keyword puts the variable in the bindings for the current script and groovy treats it (mostly) like a globally scoped variable.

Pass a variable from bash to groovy

stages { stage("Determine What To Build") { agent any steps { sh '''#!/bin/bash echo true > my_app_CHANGED.txt // pipe something into a text file in your working directory. oooooo so0o0o0o0o diiiiiirty. ''' script { try { my_app_CHANGED_UNSAFE = readFile('my_app_CHANGED.txt') // assign contents of file to groovy variable here my_app_CHANGED = "${my_app_CHANGED_UNSAFE.trim()}" // need to trim the newline in file from the variable's value. } catch (exception) { my_app_CHANGED = false // in case the bash command failed. } } echo "${my_app_CHANGED}" // true } } }

Pass a variable from groovy to groovy

Ensure the entire thing is encased in "". ${blah} or $blah can both be used. GOOD - echo "Deploying my_app to ${DEPLOYMENT_GATEWAY}-0, ${ENVIRONMENT}, ${PACKAGE}" BAD - echo Deploying my_app to "${DEPLOYMENT_GATEWAY}"-0, "${ENVIRONMENT}", "${PACKAGE}"

stages { stage("Determine What To Build") { agent any steps { script { if ("${DEPLOY_TO}" == 'Somewhere' ) { DEPLOYMENT_GATEWAY = 'abc.somewhere.com' ENVIRONMENT = 'my_app-prod' PACKAGE = "my_app-${BRANCH_NAME}.tgz" echo "${DEPLOYMENT_GATEWAY}" echo "${ENVIRONMENT}" echo "${PACKAGE}" if ("${my_app_CHANGED}" == 'true') { switch("${BRANCH_NAME}") { case ".*": echo "Deploying my_app to ${DEPLOYMENT_GATEWAY}-0, ${ENVIRONMENT}, ${PACKAGE}" //sh gui_deployer.sh "${DEPLOYMENT_GATEWAY}" 8022 "${ENVIRONMENT}" "${PACKAGE}" echo "Deploying my_app to ${DEPLOYMENT_GATEWAY}-1, ${ENVIRONMENT}, ${PACKAGE}" //sh gui_deployer.sh "${DEPLOYMENT_GATEWAY}" 8023 "${ENVIRONMENT}" "${PACKAGE}" break } } else { echo "Nothing was deployed because the commit didn't include any changes to my_app." } } else { echo "Nothing was deployed because no environment was selected." return } } } } }

Pass a variable from groovy to a single line shell script

Ensure the entire thing is encased in "", not just the ${variable}.

script { def SOMETHING = "https://some.thing.com" sh "echo ${SOMETHING}" sh "SOMETHING=${SOMETHING}; echo SOMETHING" }

Pass a variable from groovy to a multiline line shell script

Make sure the """ are with double quotes. ''' sucks. pass the variable inside double quotes: "${variable}" if there is a bash $ being used, such as when referencing a bash variable $MYVAR, you need to escape it: \$MYVAR

script { def SOMETHING = "https://some.thing.com" sh """ eval \$(docker-machine env somenode) echo "${SOMETHING}" """ }

Assign groovy string to groovy variable which contains another groovy variable

Once again, ensure the entire thing is encased in "", not just the ${variable}.

script { PACKAGE = "my_app-${BRANCH_NAME}.tgz" }

Choosing which parallel stages to run based on conditions or parameters previously set

stages { stage("1") { agent any parallel ( "Package Consumer" : { echo "${my_app_1_CHANGED}" script { if ("${my_app_1_CHANGED}" == 'true') { sh ''' case "${BRANCH_NAME}" in *) echo Compressing Consumer GUI Package rm -f my_app_1-"${BRANCH_NAME}".tgz || true tar -czf my_app_1-"${BRANCH_NAME}".tgz -C my_app_1/web . ;; esac ''' } else { echo "Nothing was tarballed because the commit didn't include any changes to my_app_1." } } }, "Package Manager" : { echo "${my_app_2_CHANGED}" script { if ("${my_app_2_CHANGED}" == 'true') { sh ''' case "${BRANCH_NAME}" in *) echo Compressing Manager GUI Package rm -f my_app_2-"${BRANCH_NAME}".tgz || true tar -czf my_app_2-"${BRANCH_NAME}".tgz -C my_app_2/web . ;; esac ''' } else { echo "Nothing was tarballed because the commit didn't include any changes to my_app_2." } } }, "Package Operator" : { echo "${my_app_3_CHANGED}" script { if ("${my_app_3_CHANGED}" == 'true') { sh ''' case "${BRANCH_NAME}" in *) echo Compressing Operator GUI Package rm -f my_app_3-"${BRANCH_NAME}".tgz || true tar -czf my_app_3-"${BRANCH_NAME}".tgz -C my_app_3/web . ;; esac ''' } else { echo "Nothing was tarballed because the commit didn't include any changes to my_app_3." } } } ) } }

Escaping $ in ""

sh ''' SOMETHING=hello echo $SOMETHING buddy ''' // hello buddy sh """ SOMETHING=hello echo $SOMETHING """ // buddy sh """ SOMETHING=hello echo \$SOMETHING buddy """ // hello buddy

Junit stupidity in the post section

post { always { script { junit "my_app/coverage/junit/*.xml" } } }

Error stating that the time the test was run was older than some current time. Apparently if its more than something like 4 seconds, you'll get this error.

post { always { script { sh "sudo touch ${WORKSPACE}/my_app/coverage/junit/*.xml" junit "${WORKSPACE}/my_app/coverage/junit/*.xml" } } }

Touch the damn file right before. Not a solution, a bandaid, like everything about jenkins, one giant ball of bandaids. However this will also error because of the ${WORKSPACE} variable in the junit command. I dont know why.

post { always { script { sh "sudo touch ${WORKSPACE}/my_app/coverage/junit/*.xml" junit "my_app/coverage/junit/*.xml" } } }

This one works then.

Disabling concurrent builds on a multistage pipeline doesn't work if you use agents in the stages

pipeline { agent none options { buildDiscarder(logRotator(numToKeepStr: '10')) disableConcurrentBuilds() } stages { stage("1") { agent any steps { ... } } stage("2") { agent any steps { ... } } } }

Results in:

my_build-TWRKUBXHW7FVLDXTUXR7V4NSBGZMX4K65ZYM6WHW3NCJK5DECL5Q my-build-TWRKUBXHW7FVLDXTUXR7V4NSBGZMX4K65ZYM6WHW3NCJK5DECL5Q@2

For 2 concurrent builds even when we clearly specified in the pipeline options to disableConcurrentBuilds()

pipeline { agent any options { buildDiscarder(logRotator(numToKeepStr: '10')) disableConcurrentBuilds() } stages { stage("1") { steps { ... } } stage("2") { steps { ... } } } }

Use the global agent.

#jenkins #groovy #bash #continuous integration #ci

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