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  <meta charset="utf-8">
  <title>Decimal to binary — toString(2)</title>
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<body>
  <h1>Built-in toString(2)</h1>
  <p>Edit <code>n</code>, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function toBinaryBuiltin(n) {
        if (n < 0) {
          throw new Error("This helper expects a nonnegative integer");
        }
        return n.toString(2);
      }
      var n = 15;
      var lines = [];
      lines.push("Minimal: " + toBinaryBuiltin(n));
      lines.push("Zero: " + toBinaryBuiltin(0));
      lines.push("Padded 8 bits: " + (15).toString(2).padStart(8, "0"));
      lines.push("64: " + (64).toString(2));
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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JavaScript Decimal to Binary — toString(2) (Try It)