Array functions can be combined

Chain methods for powerful transformations

let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// Get squares of even numbers
let evenSquares = numbers
  .filter(number => number % 2 === 0)
  .map(number => number * number);

console.log(evenSquares); // [4, 16, 36, 64, 100]