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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array filter() — even numbers</title>
</head>
<body>
  <h1>filter() — even numbers</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 5, 10, 15, 20];
      var evenNumbers = numbers.filter(function (num) {
        return num % 2 === 0;
      });
      document.getElementById("out").textContent =
        JSON.stringify(evenNumbers) + "\n" +
        JSON.stringify(numbers);
    })();
  </script>
</body>
</html>

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JavaScript Array filter() — even numbers (Try It)