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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.first() vs .eq(0)</title>
</head>
<body>
  <h3>.first()</h3>
  <ul id="first-demo">
    <li>Item 1</li><li>Item 2</li><li>Item 3</li>
  </ul>
  <h3>.eq(0)</h3>
  <ul id="eq-demo">
    <li>Item 1</li><li>Item 2</li><li>Item 3</li>
  </ul>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#first-demo li").first().css("color", "green");
    $("#eq-demo li").eq(0).css("color", "green");
  </script>
</body>
</html>

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jQuery .first() vs .eq(0) (Try It)