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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>trimStart vs family</title>
</head>
<body>
  <h1>trimStart vs trim / trimEnd</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var s = "  abc  ";
    var lines = [
      "trimStart: " + JSON.stringify(_.trimStart(s)),
      "trimEnd:   " + JSON.stringify(_.trimEnd(s)),
      "trim:      " + JSON.stringify(_.trim(s))
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Lodash _.trimStart vs trim / trimEnd (Try It)