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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>upperFirst vs lowerFirst</title>
</head>
<body>
  <h1>upperFirst vs lowerFirst</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var lines = [
      "upperFirst: " + _.upperFirst("fred"),
      "lowerFirst: " + _.lowerFirst("Fred")
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Lodash _.upperFirst vs _.lowerFirst (Try It)