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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>findKey — vs findLastKey</title>
</head>
<body>
  <h1>vs findLastKey</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var users = {
      barney:  { age: 36, active: true },
      fred:    { age: 40, active: false },
      pebbles: { age: 1,  active: true }
    };
    function isActive(o) { return o.active; }
    document.getElementById("out").textContent =
      JSON.stringify(_.findKey(users, isActive)) + "\n" +
      JSON.stringify(_.findLastKey(users, isActive));
  </script>
</body>
</html>

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Lodash _.findKey — vs findLastKey (Try It)