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  <title>Number.EPSILON</title>
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  <pre id="out"></pre>
  <script>
    function equal(x, y) {
      return Math.abs(x - y) < Number.EPSILON;
    }
    document.getElementById("out").textContent =
      String(equal(0.1 + 0.2, 0.3)) + "
" + String(0.1 + 0.2 === 0.3);
  </script>
</body>
</html>

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Number.EPSILON — equality helper (Try It)