race.js

"use strict";
module.exports = function(
    Promise, INTERNAL, tryConvertToPromise, apiRejection) {
var isArray = require("./util.js").isArray;

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 if (!isArray(promises)) {
        return apiRejection("expecting an array, a promise or a thenable\u000a\u000a    See http://goo.gl/s8MMhc\u000a");
    }

    var ret = new Promise(INTERNAL);
    if (parent !== undefined) {
        ret._propagateFrom(parent, 4 | 1);
    }
    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);
};

};