ES6 Collections: Using Map, Set, WeakMap, WeakSet — SitePoint
Stay Relevant and Grow Your Career in TechPremium ResultsPublish articles on SitePointDaily curated jobsLearning PathsDiscounts to dev toolsStart Free Trial7 Day Free Trial. Cancel Anytime. Most major programming languages have several types of data collections. Python has lists, tuples, and dictionaries. Java has lists, sets, maps, queues. Ruby has hashes and arrays. JavaScript, up until now, had
Issue 647703003: Don't expose Array.prototype.values as it breaks webcompat - Code Review
Don't expose Array.prototype.values as it breaks webcompat Some versions of Outlook Web Access test for the existence of a 'values' property on Array instances, so adding the 'values' iterator to the prototype (even with @@unscopeables) causes breakage. This matches Gecko: they ship Array.prototype.{keys,entries} but not 'values'. BUG=409858 LOG=Y R=arv@chromium.org, danno@chromium.org Committed:
Lightweight ES6 Features That Pack A Punch
I had been staying away from ECMAScript 6 (ES6) for quite a while now despite the offerings of advanced features and syntactic sugars by ES6. Back then, ES6 was still in the draft stage. I did not want to devote my time into some fancy features that might suddenly be yank out. So when the feature set was frozen in Aug 2014, I decided that it was time to dive right in. Looking through the feature l
Preparing for ECMAScript 6: New String Methods — String.prototype.*
Stay Relevant and Grow Your Career in TechPremium ResultsPublish articles on SitePointDaily curated jobsLearning PathsDiscounts to dev toolsStart Free Trial7 Day Free Trial. Cancel Anytime. In my previous article on ES6 array methods, I introduced the new methods available in ECMAScript 6 that work with the Array type. In this tutorial, you’ll learn about new ES6 methods that work with strings: St
ES6 right now
Who? John K. Paul Penton Media I ♥ JavaScript @johnkpaul john@johnkpaul.com johnkpaul.com Ecma International ECMAScript 3 - 1999 5 - 2009 6 - 2014? but who cares? Run
ECMAScript 6 modules: the final syntax
Warning: This blog post is outdated. Instead, read chapter “Modules” in “Exploring JavaScript”. At the end of July 2014, TC39 [1] had another meeting, during which the last details of the ECMAScript 6 (ES6) module syntax were finalized. This blog post gives an overview of the complete ES6 module system. Module systems for current JavaScript # JavaScript does not have built-in support for modules,
ウェブの仕様は今どこにあるのか？
Webの仕様 ウェブの仕様といえば、W3CやWHATWG、IETFとかが思い浮かぶかもしれません。 これらの仕様が最近ではメーリングリストやIRCといった旧来のところだけではなく、GitHub上で議論されて策定が進められている事が増えています。(両方使ってるという話) この記事はそのような方法で進められてる仕様等についての紹介です。 ＊ 自分自身はそこまで仕様に対して強い興味があるわけではないので、もっと詳しい方が正しくまとめて頂きたいです。。 最初にMove The Web Forward | Guide to getting involved with standards and browser developmentを見ておくといいかもしれません。 JavaScriptの仕様 この動きが多く見られるのがJavaScript(ECMAScriptやDOM APIを含む)周りの仕様につい
An introduction to ES6 classes. - Jack Franklin
July 22, 2014An introduction to ES6 classes.SupportES6 support varies across environments and platforms, implementations get updated all the time and it's important to also note that the spec is in draft, so everything below has the potential to change. I recommend using The ES6 Compatability Table to see the current state of affairs. TraceurAll the code examples seen in this post were run through
Unicode-aware regular expressions in ES2015 · Mathias Bynens
ECMAScript 2015 introduces two new flags for regular expressions: y enables ‘sticky’ matching. u enables various Unicode-related features. This article explains the effects of the u flag. It helps if you’ve read JavaScript has a Unicode problem first. Impact on syntax Setting the u flag on a regular expression enables the use of ES2015 Unicode code point escapes (\u{…}) in the pattern. // Note: `a
Note 6. ES6: Default values of parameters
Dmitry Soshnikov Software engineer interested in learning and education. Sometimes blog on topics of programming languages theory, compilers, and ECMAScript. In this small note we’ll cover another ES6 feature, function parameters with default values. As we will see there are some subtle cases there. Manual defaults from ES5 and lower Previously default parameter values were handled manually in sev
Advanced objects in JavaScript
This posts looks beyond everyday usage of JavaScript’s objects. The fundamentals of JavaScripts objects are for the most part about as simple as using JSON notation. However, JavaScript also provides sophisticated tools to create objects in interesting and useful ways, many of which are now available in the latest versions of modern browsers. The last two topics I talk about, Proxy and Symbol, are
Firefox 34(Nightly)で String.raw が実装された件とTaggedTemplateについて - hogehoge @teramako
1039774 - Implement ES6 String.raw 仕様 12.3.7 Tagged Templates 21.1.2.4 String.raw TemplateLiteral の続き。 前回は、`(バッククォート) でくくることで、ヒアドキュメント的な複数行に渡る文字列の生成ができる事、${expression}で式の埋め込みができる事を書いた。 実は、func`...` という構文の追加もあり、funcを文字列の素となる値を引数に呼び出す機能もある。String.rawはそのためのメソッドだ。func`...`みたいなコードはTaggedTemplateと呼ばれている。 String.raw`Title: ${document.title}` // => "Title: hogehoge@teramako" // === `Titlte: ${document.tit
JS Control Flow
brilliant and want laws changed so I can marry them." Traditional control flow: from requests import get location = get('http://www.telize.com/geoip').json() lat = location['latitude'] lon = location['longitude'] weather = get('http://api.openweathermap.org/data/2.1/find/city?lat=' + str(lat) + '&lon=' + str(lon) + '&cnt=1').json() print weather['list'][0]['weather'][0]['description']
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GitHub - babel/babel: 🐠 Babel is a compiler for writing next generation JavaScript.
GitHub - tc39/proposal-Array.prototype.includes: Spec, tests, reference implementation, and docs for ESnext-track Array.prototype.includes
GitHub - tc39/proposal-exponentiation-operator: Progress tracking for ES7 exponentiation operator
GitHub - tc39/proposal-object-rest-spread: Rest/Spread Properties for ECMAScript
vNext Build fails with error message ‘Cannot find solution’ because it does not exist. - MSDN Blog
Chapter 18. Arrays
What is correct execution sequence when attach multiple handlers to the same promise. · Issue #34 · getify/native-promise-only
