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Demystifying Async Programming in Javascript - Callback Hell
getUserData(function doStuff(e, a) {
getMoreUserData(function doMoreStuff(e, b) {
getEvenMoreUserData(function doEvenMoreStuff(e, c) {
getYetMoreUserData(function doYetMoreStuff(e, c) {
console.log('Welcome to callback hell!');
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