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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isMatchWith — case</title>
</head>
<body>
  <h1>Case-insensitive</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    function customizer(objValue, srcValue) {
      if (typeof objValue === "string" && typeof srcValue === "string") {
        return objValue.toLowerCase() === srcValue.toLowerCase();
      }
    }
    var object = { city: "Chennai" };
    var source = { city: "chennai" };
    document.getElementById("out").textContent =
      String(_.isMatchWith(object, source, customizer)) + "\n" +
      String(_.isMatch(object, source));
  </script>
</body>
</html>

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Lodash _.isMatchWith — case-insensitive (Try It)