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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>inArray — basic search</title>

</head>

<body>

  <pre id="out"></pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      var arr = [4, "Pete", 8, "John"];

      document.getElementById("out").textContent = [

        '$.inArray("John", arr): ' + $.inArray("John", arr),

        '$.inArray(4, arr): ' + $.inArray(4, arr),

        '$.inArray(8, arr): ' + $.inArray(8, arr)

      ].join("\n");

    })();

  </script>

</body>

</html>

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jQuery.inArray() — Basic Search (Try It)