Promise Cancellation Is Dead — Long Live Promise Cancellation!
Promise Cancellation Is Dead — Long Live Promise Cancellation! Not very long ago Domenic Denicola (worth a follow, a very smart guy) withdrew his proposal for promise cancellation from the TC39. A lot of people might think that means that promise cancellation isn’t coming to JavaScript. Those people would be right, if you couldn’t already cancel a promise via very similar means to what was propose
Cancelable promises
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We have a problem with promises
Fellow JavaScripters, it's time to admit it: we have a problem with promises. No, not with promises themselves. Promises, as defined by the A+ spec, are awesome. The big problem, which has revealed itself to me over the course of the past year, as I've watched numerous programmers struggle with the PouchDB API and other promise-heavy APIs, is this: Many of us are using promises without really unde
Introduction to ES6 Promises - 4 functions to avoid callback hell
Update October 2018: If you need to brush up on promises and async/await, I highly recommend you look instead at my Mastering Asynchronous JavaScript course on Frontend Armory. The course contains 47 live examples and exercises, and also comes with this spiffy Promises and async/await cheatsheet. Of course, my original promises guide is still useful today! Here it is: Apart from being new and shin
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アンãƒãƒ‘ターン - ãã˜ã‚‰å…¬åœ’
Promise Anti-patternsを翻訳ã•ã›ã¦é ‚ãã¾ã—ãŸã€‚著者ã®taoofcodeã‹ã‚‰è¨±å¯ã‚’é ‚ã„ã¦ç¿»è¨³ã€æŠ•ç¨¿ã—ã¦ã„ã¾ã™ã€‚ Promiseã¯ä¸€åº¦ç†è§£ã—ã¦ã—ã¾ãˆã°ç°¡å˜ã ãŒã€ã„ãã¤ã‹é を抱ãˆã•ã›ã‚‹ãƒ‘ターンãŒã‚る。ã“ã“ã«ã‚ã‚‹ã®ã¯ç§ãŒçµŒé¨“ã—ãŸã„ãã¤ã‹ã®ã‚¢ãƒ³ãƒãƒ‘ターンã 。 ãƒã‚¹ãƒˆã•ã‚ŒãŸPromise å›ã¯è¤‡æ•°ã®Promiseã‚’ãƒã‚¹ãƒˆã™ã‚‹: loadSomething().then(function(something) { loadAnotherthing().then(function(another) { DoSomethingOnThem(something, another); }); }); å›ãŒã“れをã™ã‚‹ç†ç”±ã¯ã€ä¸¡æ–¹ã®Promiseã®çµæžœã§ä½•ã‹ã‚’ã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã‹ã‚‰ã 。then()ã¯ä¸€ã¤å‰ã®Promiseã®çµæžœã—ã‹ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯ã«æ¸¡ã›ãªã„ã®ã§ã“ã“ã§ãƒã‚§ã‚¤ãƒ³ã‚’用ã„ã‚‹ã“ã¨ã¯ã§ããªã„。 ã ãŒ
Node.jsã«PromiseãŒå†ã³ã‚„ã£ã¦æ¥ãŸï¼ - ã¼ã¡ã¼ã¡æ—¥è¨˜
tl;dr サンプルコードを付ã‘ãŸã‚‰è¨˜äº‹ãŒã‹ãªã‚Šé•·ããªã£ã¦ã—ã¾ã£ãŸã®ã§ã”注æ„下ã•ã„。 Node.jsã® current master 㧠V8ãŒã‚¢ãƒƒãƒ—デートã•ã‚Œ ES6ã® Promise ãŒä½¿ãˆã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã—ãŸï¼ˆè¦ã‚ªãƒ—ションã§ã™ãŒï¼‰ã€‚Promise を使ã†ã¨ Node.jsã®éžåŒæœŸå‡¦ç†ãŒã©ã®ã‚ˆã†ã«ãªã‚‹ã®ã‹ã€Stream 㨠Promise を組ã¿åˆã‚ã›ãŸä½¿ã„æ–¹ãªã©ã‚‚å«ã‚ã¦ç´¹ä»‹ã—ã¾ã™ã€‚ 1. ã¯ã˜ã‚ã« Nodeã®æ¬¡æœŸå®‰å®šç‰ˆ v0.12ã¯ã€ã™ã出るã¨è¨€ã‚ã‚ŒãªãŒã‚‰æ—¢ã« v0.10ã®ãƒªãƒªãƒ¼ã‚¹ã‹ã‚‰ï¼‘å¹´ãŒéŽãŽã¦ã—ã¾ã„ã¾ã—ãŸã€‚ ç¾åœ¨ã€v0.12ã®ä¸»è¦ãªæ–°æ©Ÿèƒ½ã®å®Ÿè£…ã¯å®Œäº†ã—ã¦ã„ã¾ã™ãŒã€ã¾ã 安定版ã®ãƒªãƒªãƒ¼ã‚¹ã«å‘ã‘ã¦æ‰‹å½“ã§ãã¦ã„ãªã„部分ãŒæ®‹ã£ã¦ã„ã‚‹æ„Ÿã˜ã§ã™ã€‚ãã‚“ãªæ®‹ã£ã¦ã„る部分ã®ä¸€ã¤ã ã£ãŸ V8 ã®ã‚¢ãƒƒãƒ—デートãŒå…ˆé€±æœ«ã«è¡Œã‚ã‚Œã¾ã—ãŸã€‚ deps: update v8 to 3.24.40 (3/19ç¾åœ¨ã¯
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
DailyJS: JavaScript Promises ... In Wicked Detail
This post is by Matt Greer. You can find the original here: mattgreer.org/articles/promises-in-wicked-detail/ I’ve been using Promises in my JavaScript code for a while now. They can be a little brain bending at first. I now use them pretty effectively, but when it came down to it, I didn’t fully understand how they work. This article is my resolution to that. If you stick around until the end, yo
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
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GitHub - tc39/proposal-cancelable-promises: Former home of the now-withdrawn cancelable promises proposal for JavaScript
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