Dewey Library - HV8079.B62 A44 2019

Dewey Library - JC328.6.T54 2018

Online Resource

Dewey Library - HV8141.R63 2019

Dewey Library - U264.5.G7 B39 2019

Dewey Library - U263.A44 2019

In Gangtok some buildings had developed cracks and people were out on the streets.

The owners of buildings and shops have accused the authorities of selectively targeting them.

MeT said the cyclonic storm is expected to enter the state on Sunday morning.

He enquired about the cyclone situation and directed officials to be on high alert.

The opposition party accused the state government of adopting a "casual and callous" attitude.

Berlin ; New York : Springer, [2005]

Berlin ; New York : Springer, [2007]

Gunter, Michael M., 1969- author

Dale, Mark R. T. (Mark Randall Thomas), 1951- author

Oliver, Chadwick Dearing, 1947- author

Kwasinski, Alexis, 1970- author

Oppenheimer, Michael, author

Australia

Australia, author

The logins were put up for sale at 1 pence (1.25 cents) each and were discovered and bought by cybersecurity intelligence company Cyble, the paper said

Realme has extended warranty on products, which expired during the lockdown period, till June 30

McNamara, Ken

Gilligan, Rorie Alexander, author

Power supply disrupted in several parts

Panel Alex MacCaw (twitter github blog) Jacob Thornton (Fat) (twitter github blog) AJ O’Neal (twitter github blog) Jamison Dance (twitter github blog) Joe Eames (twitter github blog) Charles Max Wood (twitter github Teach Me To Code Intro to CoffeeScript) Discussion Bower.js (web) Bower.js (twitter) Bower.js (github) SXSW Package managers ender-js BPM hem Benefits Small components Yeoman.io Browserify Dependencies Segmenting the community Transports Mozilla (github) Commands Building an actual package manager node.js Moving parts of a package manager Events Challenges Ember.js Mobile web application development Google Chrome apps Desktop apps in JavaScript Picks Kershaw Ken Onion Tactical Blur Folding Knife (AJ) The xx: Coexist (Jamison) Neil Armstrong’s Solemn but Not Sad Memorial Cathedral (Jamison) Collective Soul Cat (Jamison) Amazon Prime (Joe) Star Trek Original Series on Amazon Prime (Joe) Functional Programming Principles in Scala: Martin Odersky (Joe) Domo (hiring!) (Joe) Delegation in Google (Chuck) Civilization IV (Chuck) Fujitsu ScanSnap (Chuck) Bill Nye’s Twitter Account getting suspended was not cool (Jacob) Github + Twitter profile redesign (Jacob) Avoid 7/11 Hot Dog Flavored Chips (Jacob) The Big Picture (Alex) CoffeeScriptRedux (Alex) Stripe (Alex)

Panel Tom Dale (twitter github blog Tilde Inc.) James Halliday (twitter github substack.net) AJ O’Neal (twitter github blog) Jamison Dance (twitter github blog) Merrick Christensen (twitter github) Joe Eames (twitter github blog) Tim Caswell (twitter github howtonode.org) Charles Max Wood (twitter github Teach Me To Code Rails Ramp Up) Discussion 01:52 - James Halliday Introduction browserify 02:37 - Tom Dale Introduction iCloud Ember.js Big Data & Hadoop 04:47 - Specialized vs Monolithic github.com/tildeio Idiology Micro Libraries 14:13 - Learning Frameworks 18:04 - Making things modular 25:23 - Picking the right tool for the job 27:44 - voxel.js & emberjs emberjs / packages BPM - Browser Package Manager NPM - Node Packaged Modules testling-ci Backbone.js 38:19 - Module Systems CommonJS 41:14 - Cloud9 Use Case 43:54 - Bugs jQuery Source Code Picks jQuery 2.0 (Merrick) ECMAScript 6 Module Definition (Merrick) AMD (Merrick) Yiruma (Joe) Elementary (Joe) Miracle Berry Tablets (AJ) The Ubuntu You Deserve (AJ) Bravemule (Jamison) RealtimeConf Europe (Tim) visionmedia / cpm (Tim) Why I Love Being A Programmer in Louisville (or, Why I Won’t Relocate to Work for Your Startup: Ernie Miller (Chuck) Is Audio The Next Big Thing In Digital Marketing? [Infographic] (Chuck) testling-ci (James) voxel.js (James) CAMPJS (James) Discourse (Tom) Williams-Sonoma 10-Piece Glass Bowl Set (Tom) The Best Simple Recipes by America’s Test Kitchen (Tom) Next Week Why Javascript is Hard Transcript JAMISON:  You can curse but we will just edit it out and replace it with fart noises. TOM:  I’ll be providing plenty of my own. [Laughter] JAMISON:  Okay, good. [Hosting and bandwidth provided by the Blue Box Group. Check them out at Bluebox.net.] [This episode is sponsored by Component One, makers of Wijmo. If you need stunning UI elements or awesome graphs and charts, then go to Wijmo.com and check them out.] CHUCK:  Hey everybody and welcome to Episode 47 of the JavaScript Jabber show. This week on our panel, we have AJ O’Neal. AJ:  Yo! Yo! Yo! Coming at you not even live! CHUCK:  [Laughs] Alright, Jamison Dance. JAMISON:  Hi guys, it’s tough to follow that. CHUCK:  Merrick Christensen. MERRICK:  Hey. CHUCK:  Joe Eames. JOE:  Howdy! CHUCK:  Tim Caswell. TIM:  Hello. CHUCK:  I’m Charles Max Wood from DevChat.tv. And this week, we have two guests. The first one is Tom Dale. TOM:  Hey, thanks for having me. CHUCK:  The other is James Halliday. JAMES:  Yep. Hello. CHUCK:  Welcome to the show, guys. We were having a conversation a while back, I don’t remember if it was during another episode or after another episode. But we were having a discussion over code complexity and having like small simple libraries or small simple sets of functionality versus large monolithic sets of functionality, and how to approach those and when they’re appropriate. So, we brought you guys on to help us explore this because you're experts, right? TOM:  I don’t think that’s a fair analysis of the situation, but we can certainly fumble our way through something. [Laughter] CHUCK:  Alright. So, why don’t you guys, real quick, just kind of introduce yourselves? Give us a little background on what your experience is so that we know which questions to ask you guys. James, why don’t you start? I know you’ve been on the show before. JAMES:  Hello. I suppose I wrote Browserify which is relevant here. It’s a common JS style, bundler packager thing that just uses NPM. And I have a bunch of other libraries. And I really like doing data development as just a bunch of little modules put together. They are all published completely independently on NPM. I think I’m up to like 230-ish some odd modules on NPM now. So, I’ve been doing that and I really like that style.

Panel Valerio Proietti (twitter github) Arian Stolwijk (twitter github blog) Joe Eames (twitter github blog) Merrick Christensen (twitter github) Jamison Dance (twitter github blog) Charles Max Wood (twitter github Teach Me To Code Rails Ramp Up) Discussion 01:08 - Arian Stolwijk Introduction MooTools Developer Symbaloo 01:39 - Valerio Proietti Introduction MooTools Creator Spotify 02:21 - What is MooTools? Github - MooTools 07:04 - The Class System mootools / prime 09:36 - Milk 10:25 - Design Goals Ghost 11:19 - Prime mootools / wrapup CommonJS 14:18 - MooTools vs jQuery 19:53 - Using MooTools and jQuery together Object Oriented jQuery with MooTools @jQuery Conference: Ryan Florence 21:08 - MooTools for Frameworks epitome neuro Github - MooTools 23:48 - Chaining MooTools Demos - Chaining 26:59 - Request API for Ajax calls 29:11 - Favorite MooTools-using Websites Spotify 9GAG 29:45 - Accomplishments Class System wrapup arian / prime-util 31:36 - The history of MooTools script.aculo.us moo.fx Picks Wasteland 2 (Joe) The Lost Fleet Series by Jack Campbell (Joe) MooTools (Merrick) People who can ride on airplanes for the first time (Merrick) ES6 Module Transpiler - Tomorrow's JavaScript module syntax today (Jamison) ajacksified / song-of-github (Jamison) Community Vote for OpenWest Conference 2013 (Jamison) walmartlabs / hapi (Jamison) Cornify (Chuck) Parade of Homes (Chuck) Dave Ramsey's Financial Peace University (Chuck) Floby / node-libspotify (Valerio) visionmedia / superagent (Valerio) kamicane / moofx (Valerio) Why Mozilla Matters: Brendan Eich (Arian) Ubuntu (source code) (Arian) Next Week QUnit with Jörn Zaefferer Transcript MERRICK:  Yeah, call me Mer-rock, I’m cool with that. [Hosting and bandwidth provided by the Blue Box Group. Check them out at Bluebox.net.] [This episode is sponsored by Component One, makers of Wijmo. If you need stunning UI elements or awesome graphs and charts, then go to Wijmo.com and check them out.] CHUCK:  Hey, everybody and welcome to Episode 49 of the JavaScript Jabber Show. This week on our panel, we have Joe Eames. JOE:  Howdy. CHUCK:  We have Merrick Christensen.  MERRICK:  Hey, guys. CHUCK:  Jamison Dance. JAMISON:  Hello friends. CHUCK:  And I'm Charles Max Wood from DevChat.tv. And I just want to remind you, if you're going to sign up for Rails Ramp Up, you have one week. We also have two special guests and that is Valerio Proietti VALERIO:  Hello. CHUCK:  And Arian Stolwijk. ARIAN:  Hello. CHUCK:  And I think I got close on those names. Okay. So, why don't we have Arian go first? I'd like you just to introduce yourself really quickly for people who aren’t familiar with who you are? ARIAN:  So, I’m Arian. I'm a MooTools developer mostly. Besides that, I work for a company called Symbaloo which is bookmark website page. Besides that, I'm actually still studying for my Master’s Degree in Embedded Systems. And that's about it. CHUCK:  Cool. And Valerio, do you want to introduce yourself? VALERIO:  Sure. Well, I created MooTools a few years ago and since then, a lot of cool people have joined the project like Arian who we have here today. I’m currently working in Sweden at Spotify. CHUCK:  Oh, cool! MERRICK:  Very cool! CHUCK:  Yeah, we like Spotify. MERRICK:  Is that the headquarters of Spotify is in Sweden? VALERIO:  Yeah, this is the where the magic happens. They have other offices but they're not as important as the Swedish one. [Laughter] VALERIO:  I'm kidding. Everybody’s important, not just the Swedish one. CHUCK:  Very nice, very nice. Alright. So, do you guys want to just take a minute and explain what MooTools is? I think people have some idea, but just to get kind of a base line for the rest of the conversation. VALERIO:  Yes,

Panel Alex MacCaw (twitter github blog) Joe Eames (twitter github blog) Jamison Dance (twitter github blog) AJ O’Neal (twitter github blog) Charles Max Wood (twitter github Teach Me To Code Rails Ramp Up) Discussion 01:13 - Going Rogue Video 02:12 - Alex MacCaw Introduction 029 JSJ Bower.js with Alex MacCaw and Jacob Thornton JavaScript Web Applications: jQuery Developers' Guide to Moving State to the Client by Alex MacCaw The Little Book on CoffeeScript: The JavaScript Developer's Guide to Building Better Web Apps by Alex MacCaw 02:44 - Monocle Alternative for Hacker News 03:39 - Speed Alex MacCaw: Time to first tweet sinatra MVC Framework Synchronicity 10:48 - SEO Google Webmaster Tools The Google Webmaster Video on Single-page Apps / SEO Alex MacCaw: SEO in JS Web Apps 14:01 - The Social Aspect of Monocle/Community 17:09 - Caching 17:47 - Google Website Optimizer 18:26 - Responsiveness 21:00 - Client-side & Server-side 25:11 - Testing for Performance PageSpeed Insights 28:39 - The Design Process sinatra sequel 31:44 - Sourcing.io Sourcing.io Signup 34:15 - Inspiration Picks MicroFormat Tool (AJ) Google Markup Helper (AJ) Gmail Markup Schemas (AJ) OUYA (AJ) TowerFall (AJ) Final Fantasy 7 (emulator) Final Fantasy 7 (PC) (AJ) Sunlounger (Joe) Pebble Watch (Joe) ng-conf (Joe) Book Yourself Solid: The Fastest, Easiest, and Most Reliable System for Getting More Clients Than You Can Handle Even if You Hate Marketing and Selling by Michael Port (Chuck) Coder (Alex) List of Ig Nobel Prize winners (Alex) Next Week Working From Home Transcript ALEX:  The rain in Spain falls mainly on the plain. [Hosting and bandwidth provided by the Blue Box Group. Check them out at BlueBox.net.]  [This episode is sponsored by Component One, makers of Wijmo. If you need stunning UI elements or awesome graphs and charts, then go to Wijmo.com and check them out.]  [This podcast is sponsored by JetBrains, makers of WebStorm. Whether you’re working with Node.js or building the frontend of your web application, WebStorm is the tool for you. It has great code quality and code exploration tools and works with HTML5, Node, TypeScript, CoffeeScript, Harmony, LESS, Sass, Jade, JSLint, JSHint, and the Google Closure Compiler. Check it out at JetBrains.com/WebStorm.] CHUCK:  Hey everybody and welcome to episode 77 of the JavaScript Jabber show. This week on our panel, we have Joe Eames. JOE:  Hey there. CHUCK:  Jamison Dance. JAMISON:  Hey friends. CHUCK:  AJ O’Neal. AJ:  It'sa mia, it'sa AJ. CHUCK:  I’m Charles Max Wood from DevChat.TV. And before I introduce our guest, I just want to make a quick announcement. Tomorrow as we’re recording this, so when you get this episode it will be last Friday, is my Freedom Day. It’s the day I got laid off from my last full-time job and went freelance. So in honor of that, I’m putting together a video. I’ve called it ‘Going Rogue’. Yes, I know that there’s a political thing around that, whatever. Anyway, I called it ‘Going Rogue’. You can get it at GoingRogueVideo.com. It’s basically the first year of me going freelance. I’ve just talked through how it all went. The mistakes I made, the things I learned, the things I did right, and just gave general advice to anyone who’s looking to go freelance. Or if you’re interested in some of the challenges that come with that, it’s a video that I’m putting together to kind of explain that. Like I said, it’s free. You can get it at GoingRogueVideo.com. Yeah, I’m pretty excited about it. I’m also excited about Freedom Day. Anyway, we also have a special guest today, and that’s Alex MacCaw. ALEX:  How do you do? Thank you for having me. CHUCK:  You’ve been on the show before, but it’s been almost a year. Do you want to introduce yourself again? ALEX:  Well, I’m mostly a JavaScript programmer.

The panelists discuss TC39 with Alex Russell.

The panelists discuss the MEAN stack with Ward Bell and Valeri Karpov.

02:27 - Alex Eagle Introduction

• Twitter
• GitHub
• Google

02:54 - Jonathan Turner Introduction

• Twitter
• GitHub
• Microsoft
• [Talk] Jonathan Turner: TypeScript and Angular 2 @ ng-conf 2015
• [Talk] Jonathan Turner: TypeScript and Angular 2 @ Angular U 2015

03:30 - What is TypeScript?

04:40 - Google + Microsoft = <3 (Angular Adopting TypeScript)

• Rob Eisenberg
• AtScript
  • Jonathan Turner: Angular 2: Built on TypeScript

07:18 - TypeScript Accommodating Angular

• TC39
• Yehuda Katz
• Aurelia

09:28 - Surge of Interest in Adopting a Typechecker, Type System

14:21 - Angular: Creating a New Language

• Killing Off Wasabi - Part 1 (FogBugz Article)
• traceur

16:46 - The Angular 2 Component System and How it Uses New Annotations for Classes

18:01 - Annotations and Decorators

22:06 - TypeScript and Babel?; Adding New Features

25:25 - Non-Angular Users Adopting TypeScript

• Visual Studio Code

34:55 - Tooling and Setting Modes for Linting and Static Analysis

36:58 - Using Libraries Outside the TypeScript Ecosystem

38:11 - Type Definition Files

40:15 - Content of the Type System

43:19 - Duck Typing

45:12 - Getting People to Care about TypeScript

49:16 - The Angular and TypeScript Relationship

Picks

f.lux (Aimee)
Jafar Husain: Functional Programming in Javascript (learnrx) (Aimee)
Startup Timelines (Jamison)
Friday Night Lights (Jamison)
React Rally (Jamison)
Evan Farrer: Unit testing isn't enough. You need static typing too. (Dave)
AngularConnect (Joe)
ng-click.com (Joe)
mdn.io (Joe)
Sonic Pi (Chuck)
Error Prone (Alex)
AudioScope-ng2 (Jonathan)
The Nintendo World Championships (Jonathan)

Check out React Remote Conf

01:56 - Valeri Karpov Introduction

• Twitter
• GitHub
• Blog
• JavaScript Jabber Episode #92: The MEAN Stack with Ward Bell and Valeri Karpov

02:17 - Booster Fuels

03:06 - ES2015 Generators

• The 80/20 Guide to ES2015 Generators by Valeri Karpov
• co

05:47 - try-catch

07:49 - Generator Function vs Object

• The Fibonacci Sequence

10:39 - Generator Use Cases

12:02 - Why in ES6 would they come out with both native promises and generators?

• Koa

14:04 - yield star and async await

17:06 - Wrapping a Generator in a Promise

19:51 - Testing

20:56 - Use on the Front-end

22:14 - The 80/20 Guide to ES2015 Generators by Valeri Karpov and Tech Writing

• nightmare
• Professional AngularJS

Picks

Why and How Testing Can Make You Happier (Aimee)
Pitango Gelato (Aimee)
The Primal Blueprint by Mark Sisson (Chuck)
The Primal Blueprint 21-Day Total Body Transformation (Chuck)
acquit (Valeri)
nightmare (Valeri)
now (Valeri)
The 80/20 Guide to ES2015 Generators by Valeri Karpov (Valeri)

Welcome to the 11th My JS Story! Today, Charles Max Wood welcomes Valeri Karpov. Valeri is a Platform Tech Lead at Booster Fuels, the author of Professional Angular JS and The 80/20 Guide to ES2015 Generators, and a blogger at codebarbarian.com. He is also the one who maintains mongoose JS. Stay tuned to My JS Story Valeri Karpov to learn more how he started coding and what he is currently up to!

On this week's episode of My JS Story, Charles Max Wood interviews Alex Russell. Alex is a software engineer on the Chrome team. He focuses on designing new features and running their standards work. He appeared as a guest on episode 87, where he talked about TC39. Tune in to his story!

Panel:

• Joe Eames
• Aimee Knight
• AJ ONeal

Special Guests: Tom Dale

In this episode, the JavaScript Jabber panel talks to Tom Dale about Ember 3.0 and the future of Ember. Tom is the co-creator of Ember and is a principle staff engineer at LinkedIn where he works on a team called Presentation Infrastructure. They talk about being in the customer service role, having a collaborative culture, and all the information on Ember 3.0. They also touch on the tendency towards disposable software, the Ember model, and more!

In particular, we dive pretty deep on:

• How Joe met Tom
• Programmers as rule breakers
• The pressure to conform
• Tom intro
• Staff engineer at LinkedIn
• Customer service role
• Having a way to role improvements out to a lot of different people
• JavaScript and Ember at LinkedIn
• Having a collaborative culture
• All about Ember 3.0
• Banner feature – there is nothing new
• Cracked how you develop software in the open source world that has longevity
• Major competition in Backbone previously
• The Ember community has never been more vibrant
• Tendency towards disposable software
• The idea of steady iteration towards improvement
• The Ember model
• Being different from different frameworks
• Ember adoption rates
• Python 3
• Valuable from a business perspective to use Ember
• Ember community being friendly to newbies
• How much Ember VS how much JavaScript will a new developer have to learn?
• And much, much more!

Links:

• Ember
• LinkedIn
• JavaScript
• Backbone
• Python
• @tomdale
• tomdale.net
• Tom’s GitHub

Sponsors

• Kendo UI
• Sentry
• Digital Ocean

Picks:

Joe

• Framework Summit
• Jayne
• React sent Evan You a cake

Aimee

• Maker's Schedule, Manager's Schedule by Paul Graham

AJ

• James Veitch

Tom

• JavaScript Tech Talk
• Drake’s Ties
• Melissa Watson Ellis at Hall Madden

Panel:

• Charles Max Wood
• AJ O’Neal
• Aimee Knight

Special Guests: Valeri Karpov 

In this episode, the panel talks with programmer, Valerie Karpov from Miami, Florida. He is quite knowledgeable with many different programs, but today’s episode they talk specifically about Async/Await and Promise Generators. Val is constantly busy through his different endeavors and recently finished his e-book, “Mastering Async/Await.” Check-out Val’s social media profiles through LinkedIn, GitHub, Twitter, and more.

Show Topics:

1:20 – Val has been on previous episodes back in 2013 & 2016.

1:37 – Val’s background. He is very involved with multiple companies. Go checkout his new book!

2:39 – Promises generators. Understand Promises and how things sync with Promises. Val suggests that listeners have an integrated understanding of issues like error handling.

3:57 – Chuck asks a question.

6:25 – Aimee’s asks a question: “Can you speak to why someone would want to use Async/Await?”

8:53 – AJ makes comments.

10:09 – “What makes an Async/Await not functional?” – Val

10:59 – “What’s wrong with Promises or Async/Await that people don’t like it?” - AJ

11:25 – Val states that he doesn’t think there really is anything wrong with these programs it just depends on what you need it for. He thinks that having both gives the user great power.

12:21 – AJ’s background is with Node and the Python among other programs.

12:55 – Implementing Complex Business Logic.

15:50 – Val discusses his new e-book.

17:08 – Question from Aimee.

17:16 – AJ answers question. Promises should have been primitive when it was designed or somewhat event handling.

17:46 – The panel agrees that anything is better than Call Backs.

18:18 – Aimee makes comments about Async/Await.

20:08 – “What are the core principles of your new e-book?” – Chuck

20:17 – There are 4 chapters and Val discusses, in detail, what’s in each chapter.

22:40 – There could be some confusion from JavaScript for someone where this is their first language. Does Async/Await have any affect on the way you program or does anything make it less or more confusing in the background changes?

24:30 – Val answers the before-mentioned question. Async/Await does not have anyway to help with this (data changes in the background).

25:36 – “My procedural code, I know that things won’t change on me because it is procedural code. Is it hard to adjust to that?” – AJ

26:01 – Val answers the question.

26:32 – Building a webserver with Python. 

27:31 – Aimee asks a question: “Do you think that there are cases in code base, where I would want to use Promises? Not from a user’s perspective, but what our preferences are, but actual performance. Is there a reason why I would want to use both or be consistent across the board?”

28:17 – Val asks for some clarification to Aimee’s question.

29:14 – Aimee: “My own personal preference is consistency. Would I want to use Promises in ‘x’ scenario and/or use Async/Await in another situation?”

32:28 – Val and AJ are discussing and problem solving different situations that these programs

33:05 – “When would you not want to use Async/Await?” – AJ

33:25 – Val goes through the different situations when he would not use Async/Await. 

33:44 – Chuck is curious about other features of Async/Await and asks Val.

36:40 – Facebook’s Regenerator

37:11 – AJ: “Back in the day, people would be really concerned with JavaScript’s performance even with Chrome.” He continues his thoughts on this topic.

38:11 – Val answers the AJ’s question.

39:10 – Duck JS probably won’t include generators.

41:18 – Val: “Have anyone used Engine Script before?” The rest of the panel had never heard of this before.

42:09 – Windows Scripting Host

42:56 – Val used Rhino in the past.

43:40 – Val: “Going back to the web performance question...”

47:08 – “Where do you see using Async/Await the most?” – Chuck

47:55 – Val uses Async/Await for everything on the backend because it has made everything so easy for him.

48:23 – “So this is why you really haven’t used Web Pack?” – AJ

49:20 – Let’s go to Aimee’s Picks!

50:18 – AJ’s story, first, before we get to Promises.

54:44 – Let’s transition to Promises Finally.

54:53 – Val talks about Promises Finally.

59:20 – Picks

Links:

• JavaScript
• Valeri Karpov’s GitHub
• Valeri Karpov’s Twitter
• Valeri Karpov’s LinkedIn
• New E-Book: Mastering Async/Await
• Node
• Python
• Windows Scripting Host
• Facebook’s Regenerator
• Rhino

Sponsors:

• Kendo UI
• Sentry
• Digital Ocean
•  

Picks:

Charles

• YouTube Video “IKEA” by Coulton
• Conference
• Amazon Prime Day

Aimee

• Blog Post Article

AJ

• IKEA
• https://ppl.family

Val

• https://www.npmjs.com/package/serve
• http://bit.ly/ultimate-skiing
• http://asyncawait.net/jsjabber
• New E-Book: Mastering Async/Await

Valeri Karpov is a maintainer on Mongoose, has started a few companies, and works for a company called Booster Fuels. Today’s topic debugging with Async/Await. The panel talks about some of the challenges of debugging with Async. AJ, however, has never encountered the same problems, so he shares his debugging method. 

Valeri differentiates between .catch vs try...catch, and talks about why he prefers .catch. There are two ways to handle all errors in an async function without leading to an unhandled promise rejection. The first is to wrap the entire body of the async function in a try...catch, has some limitations. Calling an async function always returns a promise, so the other approach is calling .catch on the promise to handle any errors that occur in that function body. One of the key differences is if you return a promise within an async function, and that return promise is wrapped in a try...catch, the catch block won’t get called if that promise is rejected, whereas if you call .catch on the promise that the function returns, you’ll actually catch that error. There are rare instances where this can get tricky and unintuitive, such as where you have to call new promise and have resolve and reject, and you can get unexpected behavior.

The panel discusses Valeri’s current favorite JS interview question, which is,  “Given a stream, implement a function called ‘stream to promise’ that, given a stream, returns a promise that resolves to the concatenation of all the data chunks emitted by the stream, or rejects if the stream emits an error event.” It’s really simple to get this qustion right, and really simple to get it wrong, and the difference can be catastrophic. AJ cautions listeners to never use the data event except in the cases Val was talking about, only use the readable event.

The conversation turns to the function of a readable event. Since data always pushes data, when you get a readable event, it’s up to you to call read inside the function handler, and then you get back a chunk of data, call read again and again until the read returns null. When you use readable, you are in control and you avoid piling functions into RAM. In addition, the right function will return true or false to let you know if the buffer is full or not. This is a way to mix imperative style into a stream.

The next discussion topics are the differences between imperative style and reactive style and how a waits and promises work in a normal four loop. A wait suspends the execution of a function until the promise is resolved. Does a wait actually stop the loop or is it just transpiling like a promise and it doesn’t stop the loop. AJ wrote a module called Batch Async to be not as greedy as promise.all but not as limited as other options.

The JavaScript panelists talk about different async iterators they’ve used, such as Babel. They discuss the merits of Babel, especially since baseline Android phones (which a significant portion of the population of the world uses) run UC Browser that doesn’t support Babel, and so a significant chunk of the population of the world. On the other hand, if you want to target a large audience, you need to use Babel.

Since frameworks in general don’t handle async very well, the panel discusses ways to mitigate this. They talk about different frameworks like Vue, React, and Express and how they support async functions. They discuss why there is no way for you to actually cancel an async option in an actual case, how complex canceling is, and what you are really trying to solve for in the cancellation process. 

Canceling something is a complex problem. Valeri talks about his one case where he had a specific bug that required non-generic engineering to solve, and cancelling actually solved something. When AJ has come across cancellation issues, it’s very specific to that use case. The rest of the panelists talk about their experiences with having to cancel something. 

Finally, they talk about their experience with async generator functions. A generator is a function that lets you enter into the function later. This makes sense for very large or long running data sets, but when you have a bounded items, don’t complicate your code this way. When an async generator function yields, you explicitly need to call next in order for it to pick up again. If you don’t call ‘next’, it’s essentially cancelled. Remember that object.keys and object.values are your friends. 

Panelists

• Christopher Buecheler

• AJ O’Neal

• Charles Max Wood

With special guest: Valeri Karpov

Sponsors

• The DevEd Podcast

• Sentry use the code “devchat” for 2 months free on Sentry’s small plan

• Adventures in DevOps

Links

• Mongoose

• Express 5

• Node Streams

• Pull Streams

• Masteringjs.io

• MongoDB

• Babel

• HTML

• Webpack

• Vue

• Express

• RxJS

• Console.log

• Json.stringify

• Batchasync.js

• How to Write Batch Async Functions

Follow DevChatTV on Facebook and Twitter

Picks

AJ O’Neal:

• Ethan Garofolo YouTube

Christopher Buecheler:

• Functional Design Patterns for Express.js

Charles Max Wood:

• Microsoft Ignite

• Maxcoders.io

Valeri Karpov:

• Follow Valeri on Twitter @code_barbarian and Github @vkarpov15

• Masteringjs.io

• Jurassic Park: A Novel

Makarov, Aleksandr

Sachdev, Perminder

ʻAmr, Sāmī, 1924-1998

Helman, Anat