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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toLower — compare</title>
</head>
<body>
  <h1>Case-insensitive compare</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var a = "Hello";
    var b = "HELLO";
    var lines = [
      "a: " + a,
      "b: " + b,
      "equal: " + (_.toLower(a) === _.toLower(b))
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Lodash _.toLower — case-insensitive compare (Try It)