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@nolanlawson
nolanlawson / protips.js
Last active February 4, 2024 18:06
Promise protips - stuff I wish I had known when I started with Promises
// Promise.all is good for executing many promises at once
Promise.all([
promise1,
promise2
]);
// Promise.resolve is good for wrapping synchronous code
Promise.resolve().then(function () {
if (somethingIsNotRight()) {
throw new Error("I will be rejected asynchronously!");
@domenic
domenic / readable-stream-progress.js
Last active February 10, 2020 17:05
XHR-esque progress events on top of streams
function processBodyChunkwiseWithProgress(res, processChunk) {
const dummyEventTarget = document.createElement("div"); // why isn't EventTarget constructible? :(
const lengthComputable = res.headers.has("Content-Length");
const total = res.headers.get("Content-Length") || 0;
let loaded = 0;
// Using http://underscorejs.org/#throttle
const fireProgressThrottled = _.throttle(fireProgress, 50, { trailing: false });