Promises, handlers, and chains are foundations of modern JavaScript, but they can be tricky. Here are four common traps to ...

Arrow functions are often used in JavaScript's iterator methods ... It then takes that function's return value and adds it to a new array, leaving the original array unchanged. That new array, ...

We'll prompt you when it's a good time to shift modes from "reading along" to coding. JavaScript now correctly shows us the return value of our function expression: a function (indicated by the ƒ ()) ...