Professional programmers often skip loops for tools like filter (keep only the items that pass a test) and map (change every item). You give them a tiny function, and they do the looping. A tiny function written like x => x * 2 is called an arrow function.
🎯 Write evensSquared(list): keep only the even numbers, then square each one. evensSquared([1, 2, 3, 4]) should give [4, 16].
Output
Press Run to see what your code prints.Lesson 3 of 16 · Lesson map · Your code runs safely inside this page and is never sent anywhere.