Promises

const wait1 = (fn) => { return new Promise(resolve => setTimeout(resolve, 100)) } const wait2 = (fn) => { return new Promise(resolve => setTimeout(resolve, 200)) } const wait3 = (fn) => { return new Promise(resolve => setTimeout(resolve, 300)) } wait1() .then(wait2) .then(wait3) .then(function() { console.log("All good!"); });