es.promise.all.js
1.39 KB
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'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.all` method
// https://tc39.es/ecma262/#sec-promise.all
$({ target: 'Promise', stat: true, forced: PROMISE_STATICS_INCORRECT_ITERATION }, {
all: function all(iterable) {
var C = this;
var capability = newPromiseCapabilityModule.f(C);
var resolve = capability.resolve;
var reject = capability.reject;
var result = perform(function () {
var $promiseResolve = aCallable(C.resolve);
var values = [];
var counter = 0;
var remaining = 1;
iterate(iterable, function (promise) {
var index = counter++;
var alreadyCalled = false;
remaining++;
call($promiseResolve, C, promise).then(function (value) {
if (alreadyCalled) return;
alreadyCalled = true;
values[index] = value;
--remaining || resolve(values);
}, reject);
});
--remaining || resolve(values);
});
if (result.error) reject(result.value);
return capability.promise;
}
});