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<head>
  <meta charset="utf-8">
  <title>String.trim() — compare</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var padded = "  hi  ";
    document.getElementById("out").textContent = [
      JSON.stringify(padded.trim()),
      JSON.stringify(padded.trimStart()),
      JSON.stringify(padded.trimEnd())
    ].join("\n");
  </script>
</body>
</html>

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String.trim() — one-sided (Try It)