--- /dev/null
+"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);
+};
+
+};