Promise.all run promise in parallel

promise.all.js

// taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
var p1 = Promise.resolve(3);
var p2 = 1337;
var p3 = new Promise((resolve, reject) => {
setTimeout(resolve, 100, "foo");
});

Promise.all([p1, p2, p3]).then(values => {
console.log(values); // [3, 1337, "foo"]
});