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  <meta charset="utf-8">
  <title>Lodash _.keys - arrays and strings</title>
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<body>
  <h1>_.keys - arrays, strings, null and undefined</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var sparse = [];
      sparse[2] = "two";
      var lines = [
        "array     : " + JSON.stringify(_.keys(["a", "b", "c"])),
        "sparse    : " + JSON.stringify(_.keys(sparse)),
        "string    : " + JSON.stringify(_.keys("hi")),
        "null      : " + JSON.stringify(_.keys(null)),
        "undefined : " + JSON.stringify(_.keys(undefined))
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
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Lodash _.keys - arrays, strings, null and undefined (Try It)