HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isEqualWith — undefined vs false</title>
</head>
<body>
  <h1>undefined vs false</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    function bad(a, b) {
      return typeof a === "number" && typeof b === "number" && a === b;
    }
    function good(a, b) {
      if (typeof a === "number" && typeof b === "number") {
        return a === b;
      }
    }
    var left = { x: 1 };
    var right = { x: 1 };
    document.getElementById("out").textContent =
      "bad: " + _.isEqualWith(left, right, bad) + "\n" +
      "good: " + _.isEqualWith(left, right, good);
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Lodash _.isEqualWith — undefined vs false (Try It)