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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array shift() — vs pop</title>
</head>
<body>
  <h1>shift() vs pop()</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var startQueue = ["a", "b", "c"];
      var endStack = ["a", "b", "c"];
      var lines = [
        "shift: " + startQueue.shift(),
        "after shift: " + JSON.stringify(startQueue),
        "pop: " + endStack.pop(),
        "after pop: " + JSON.stringify(endStack)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Array shift() — vs pop (Try It)