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Viewing file: Select action/file-type: import { isArray } from "../utils"; /** `Promise.race` returns a new promise which is settled in the same way as the first passed promise to settle. Example: ```javascript let promise1 = new Promise(function(resolve, reject){ setTimeout(function(){ resolve('promise 1'); }, 200); }); let promise2 = new Promise(function(resolve, reject){ setTimeout(function(){ resolve('promise 2'); }, 100); }); Promise.race([promise1, promise2]).then(function(result){ // result === 'promise 2' because it was resolved before promise1 // was resolved. }); ``` `Promise.race` is deterministic in that only the state of the first settled promise matters. For example, even if other promises given to the `promises` array argument are resolved, but the first settled promise has become rejected before the other promises became fulfilled, the returned promise will become rejected: ```javascript let promise1 = new Promise(function(resolve, reject){ setTimeout(function(){ resolve('promise 1'); }, 200); }); let promise2 = new Promise(function(resolve, reject){ setTimeout(function(){ reject(new Error('promise 2')); }, 100); }); Promise.race([promise1, promise2]).then(function(result){ // Code here never runs }, function(reason){ // reason.message === 'promise 2' because promise 2 became rejected before // promise 1 became fulfilled }); ``` An example real-world use case is implementing timeouts: ```javascript Promise.race([ajax('foo.json'), timeout(5000)]) ``` @method race @static @param {Array} promises array of promises to observe Useful for tooling. @return {Promise} a promise which settles in the same way as the first passed promise to settle. */ export default function race(entries) { /*jshint validthis:true */ let Constructor = this; if (!isArray(entries)) { return new Constructor((_, reject) => reject(new TypeError('You must pass an array to race.'))); } else { return new Constructor((resolve, reject) => { let length = entries.length; for (let i = 0; i < length; i++) { Constructor.resolve(entries[i]).then(resolve, reject); } }); } } |
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