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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array push() — basic</title>
</head>
<body>
  <h1>push() — add elements</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 2, 3];
      numbers.push(4, 5);
      document.getElementById("out").textContent = JSON.stringify(numbers);
    })();
  </script>
</body>
</html>

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JavaScript Array push() — add elements (Try It)