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  <title>Array keys() — Array.from</title>
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  <h1>keys() — Array.from</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var fruits = ["apple", "orange", "banana"];
      var indices = Array.from(fruits.keys());
      document.getElementById("out").textContent = JSON.stringify(indices);
    })();
  </script>
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JavaScript Array keys() — Array.from (Try It)