race.js•1.25 kB
"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);
};
};