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  <title>Factorial — iterative</title>
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  <h1>Iterative factorial</h1>
  <p>Edit <code>number</code>, then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){var e;e=Number.isSafeInteger(5)?"Factorial of 5 is: "+function(e){var t,n=1;for(t=2;t<=e;t++)n*=t;return n}(5):"Use a JavaScript safe integer for n.",document.getElementById("out").textContent=e}()</script>
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JavaScript Factorial — Iterative (Try It)