Arrow Functions in Array Maps

One place you're likely to find arrow functions is in array methods like map. Here's how we used map a few challenges ago:

function double(num) {
  return num * 2;
}

const original = [1, 2, 3, 4];
const doubled = original.map(double);

Now that we know how to create arrow functions, we can rewrite our double function as an anonymous arrow function.

const doubled = original.map((num) => num * 2);

Pretty nifty.

It also works when the original array has values other than numbers. Run the code in the editor for an example.

Your Turn

Create a variable called plusTwo. Use an in-place arrow function to map over randomNums, returning an array where each element of plusTwo is two more than the corresponding element in randomNums.