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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array unshift() — vs push</title>
</head>
<body>
  <h1>unshift() vs push()</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var start = [2, 3];
      var end = [2, 3];
      start.unshift(1);
      end.push(1);
      document.getElementById("out").textContent =
        "unshift: " + JSON.stringify(start) + "\n" +
        "push: " + JSON.stringify(end);
    })();
  </script>
</body>
</html>

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JavaScript Array unshift() — vs push (Try It)