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race.js
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"use strict"; module.exports = function( Promise, INTERNAL, tryConvertToPromise, apiRejection) { var util = require("./util"); var raceLater = function (promise) { return promise.then(function(array) { return race(array, promise); }); }; function race(promises, parent) { var maybePromise = tryConvertToPromise(promises); if (maybePromise instanceof Promise) { return raceLater(maybePromise); } else { promises = util.asArray(promises); if (promises === null) return apiRejection("expecting an array or an iterable object but got " + util.classString(promises)); } var ret = new Promise(INTERNAL); if (parent !== undefined) { ret._propagateFrom(parent, 3); } var fulfill = ret._fulfill; var reject = ret._reject; for (var i = 0, len = promises.length; i < len; ++i) { var val = promises[i]; if (val === undefined && !(i in promises)) { continue; } Promise.cast(val)._then(fulfill, reject, undefined, ret, null); } return ret; } Promise.race = function (promises) { return race(promises, undefined); }; Promise.prototype.race = function () { return race(this, undefined); }; };