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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setInterval() — args</title>
</head>
<body>
  <h1>Extra arguments</h1>
  <p>
    <button type="button" id="start">Start</button>
    <button type="button" id="stop">Stop</button>
  </p>
  <pre id="out">Click Start</pre>
  <script>
    (function () {
      var out = document.getElementById("out");
      var id = null;

      function greet(name) {
        out.textContent += "Hello, " + name + "\n";
      }

      document.getElementById("start").onclick = function () {
        if (id !== null) return;
        out.textContent = "";
        id = setInterval(greet, 1000, "Alex");
      };

      document.getElementById("stop").onclick = function () {
        clearInterval(id);
        id = null;
        out.textContent += "stopped\n";
      };
    })();
  </script>
</body>
</html>

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JavaScript setInterval() — extra args (Try It)