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  <title>Lodash initial — edges</title>
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<body>
  <h1>Lodash _.initial — [] and [only]</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var a = _.initial([]);
      var b = _.initial(["only"]);
      document.getElementById("out").textContent = JSON.stringify({
        emptyInput: a,
        oneElement: b
      });
    })();
  </script>
</body>
</html>

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Lodash _.initial — empty and one element (Try It)