2 module.exports = function(
3 Promise, INTERNAL, tryConvertToPromise, apiRejection) {
4 var util = require("./util");
6 var raceLater = function (promise) {
7 return promise.then(function(array) {
8 return race(array, promise);
12 function race(promises, parent) {
13 var maybePromise = tryConvertToPromise(promises);
15 if (maybePromise instanceof Promise) {
16 return raceLater(maybePromise);
18 promises = util.asArray(promises);
19 if (promises === null)
20 return apiRejection("expecting an array or an iterable object but got " + util.classString(promises));
23 var ret = new Promise(INTERNAL);
24 if (parent !== undefined) {
25 ret._propagateFrom(parent, 3);
27 var fulfill = ret._fulfill;
28 var reject = ret._reject;
29 for (var i = 0, len = promises.length; i < len; ++i) {
30 var val = promises[i];
32 if (val === undefined && !(i in promises)) {
36 Promise.cast(val)._then(fulfill, reject, undefined, ret, null);
41 Promise.race = function (promises) {
42 return race(promises, undefined);
45 Promise.prototype.race = function () {
46 return race(this, undefined);