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<head>
  <meta charset="utf-8">
  <title>Array indexOf() — basic</title>
</head>
<body>
  <h1>indexOf() — find index</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var colors = ["red", "blue", "green", "yellow", "blue"];
      document.getElementById("out").textContent = String(colors.indexOf("green"));
    })();
  </script>
</body>
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JavaScript Array indexOf() — find index (Try It)