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Fan-out promise resolution

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join-promises.js
JavaScript
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function join(promises) {
var promise = new Promise();
promise.then(
function(val) {
for (var i = 0; i < promises.length; i++) {
promises[i].resolve(val);
}
},
function(err) {
for (var i = 0; i < promises.length; i++) {
promises[i].reject(err);
}
},
function(update) {
for (var i = 0; i < promises.length; i++) {
promises[i].progress(update);
}
}
);
 
return promise;
}

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