Promises/A+
Promises/A+ An open standard for sound, interoperable JavaScript promises—by implementers, for implementers. A promise represents the eventual result of an asynchronous operation. The primary way of interacting with a promise is through its then method, which registers callbacks to receive either a promise’s eventual value or the reason why the promise cannot be fulfilled. This specification detai
ECMAScript 6 promises (2/2): the API
This blog post is outdated. Please read chapter “Promises for asynchronous programming†in “Exploring ES6â€. This blog post is an introduction to asynchronous programming via promises in general and the ECMAScript 6 (ES6) promise API in particular. It is second in a series of two posts – part one explains foundations of asynchronous programming (which you may need to learn in order to fully underst
Promise時代ã®JavaScriptã®é–¢æ•°ã®å‡¦ç†/æä¾› - mizchi's blog
最近自分ã§éžåŒæœŸå‰æã®ãƒ—ラグイン書ãã¨ãã¯Thenableãªæ„Ÿã˜ã§æ›¸ã„ã¦ã‚‹ã“ã¨ãŒå¤šã„。 Thenableã£ã¦ã®ã¯ã©ã†ã„ã†ã“ã¨ã‹ã¨ã„ã†ã¨ã€typescirptã®es6-promises ã§ã¯æ¬¡ã®ã‚ˆã†ã«å®šç¾©ã—ã¦ã‚る。 interface Thenable<R> { then<U>(onFulfilled: (value: R) => Thenable<U>, onRejected: (error: any) => Thenable<U>): Thenable<U>; then<U>(onFulfilled: (value: R) => Thenable<U>, onRejected?: (error: any) => U): Thenable<U>; then<U>(onFulfilled: (value: R) => U, onRejected: (error: any) => Thenab
Promise Anti-patterns – Tao of Code
Promises are very simple once you get your head around them, but there are a few gotchas that can leave you with your head scratching. Here are a few that got me. Nested Promises You get a whole bundle of promises nested in eachother: loadSomething().then(function(something) { loadAnotherthing().then(function(another) { DoSomethingOnThem(something, another); }); }); The reason you’ve done this is
Introduction to Promises in JavaScript
Callback Hell Callbacks are frequently used in both Node.js and client-side JavaScript to implement an asynchronous program flow. Perhaps the most common usages are jQuery’s AJAX callbacks, such as: $.get('http://my-url', function(data) { // this function will be invoked // at some point in the future // once the ajax request // has completed successfully. }); Things get more complicated once mult
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