Creating defensive objects with ES6 proxies - Human Who Codes
Posted at April 22, 2014 by Nicholas C. Zakas Tags: ECMAScript 6, JavaScript, Proxies This past week I spent an hour debugging an issue that I ultimately tracked down to a silly problem: the property I was referencing didn’t exist on the given object. I had typed request.code and it should have been request.query.code. After sternly lecturing myself for not noticing earlier, a pit formed in my sto
Promiseについて - JS.next
概要 Promiseとは非同期処理を上手く扱う為のAPIであり、パターンである。 非同期の処理の完了後に続けて処理を行いたいとき、よくコールバックパターンが使われるが、処理が連続するとコールバック地獄と言われる分かりづらいソースコードになってしまう。 また、複数の非同期処理が完了した時に処理を行うなど、コールバックパターンでは難しい事をスマートにできるのがこのPromiseである。 今まではDOMの方でDOM Promiseとして仕様策定が進められていたり、ライブラリのDeferredが有名だったが、ES2015標準に入ることになり、V8に実装された。 実装されたメソッド Promise.resolve(x) Promise.reject(x) Promise.all( [p1, p2, p3, ......] ) Promise.race( [p1, p2, p3, ......] )
ECMAScript 6 and Rest Parameter · ariya.io
ECMAScript 6 and Rest Parameter Mar 6, 2013 2 min read #es6 #javascript #web Handling a function with a variable number of arguments is always tricky in JavaScript. At least, we still have this arguments object which can be used to retrieve all arguments used to invoke a function. With the upcoming ECMAScript 6, no such hack is necessary anymore since we can start using its rest parameter feature.
ECMAScript 6 and Object Literal Property Value Shorthand · ariya.io
ECMAScript 6 and Object Literal Property Value Shorthand Feb 28, 2013 2 min read #es6 #javascript #web Constructing an object using the literal syntax is something that is very familiar to every JavaScript developer, quite likely because this reminds everyone of JSON. While every object property needs to be either a key-value pair or getter/setter, this may change in the near future. Another synta
ECMAScript 6: classes
[Update 2015-02-15] Newer version of this blog post: “Classes in ECMAScript 6 (final semantics)” During the July 2012 meeting of TC39 [1], classes have been accepted for ECMAScript 6, the upcoming version of the JavaScript language standard. This blog post explains how those classes work. It is based on Allen Wirfs-Brock’s annotated slides. Overview An ECMAScript 6 class is syntactic sugar for a c
What is the meaning of this?
YUI Blog Development What is the meaning of this? What is the meaning of this? JavaScript is an amalgam of good parts and bad parts. Its best parts came from Self (prototypes) and Scheme (lexically scoped nested functions). But the interaction of those two very good parts produced some bad parts. When a function is called with the function invocation pattern, its this is not bound to the outer fun
es6-shim – ECMAScript 6 functionality on ECMAScript 5
Update 2012-03-13: Added a section on installation. Paul Miller’s es6-shim gives you functionality that will be in ECMAScript 6 (code-named ECMAScript.next), on ECMAScript 5 engines. It was initially based on a project of mine, but adds much new functionality, Node.js compatibility, and (not least) tests. Highlights The following are a few highlights. Take a look at the tests to get more usage exa
1
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
Code Tutorials | Envato Tuts+
ECMAScript 6 compatibility table
ECMAScript.Next with David Herman of Mozilla
http://kangax.github.io/es5-compat-table/