core-js/modules/es.promise.race.js

'use strict';
var $ = require('../internals/export');
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var newPromiseCapabilityModule = require('../internals/new-promise-capability');
var perform = require('../internals/perform');
var iterate = require('../internals/iterate');
var PROMISE_STATICS_INCORRECT_ITERATION = require('../internals/promise-statics-incorrect-iteration');

// `Promise.race` method
// https://tc39.es/ecma262/#sec-promise.race
$({ target: 'Promise', stat: true, forced: PROMISE_STATICS_INCORRECT_ITERATION }, {
  race: function race(iterable) {
    var C = this;
    var capability = newPromiseCapabilityModule.f(C);
    var reject = capability.reject;
    var result = perform(function () {
      var $promiseResolve = aCallable(C.resolve);
      iterate(iterable, function (promise) {
        call($promiseResolve, C, promise).then(capability.resolve, reject);
      });
    });
    if (result.error) reject(result.value);
    return capability.promise;
  }
});