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<head>
  <meta charset="utf-8">
  <title>toNumber — prefixes</title>
</head>
<body>
  <h1>Prefixes &amp; valueOf</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    document.getElementById("out").textContent = [
      _.toNumber("  7  "),
      _.toNumber("0x1f"),
      _.toNumber("0b11"),
      _.toNumber("0o17"),
      _.toNumber("-0x10"),
      _.toNumber({ valueOf: function () { return 7; } })
    ].join(String.fromCharCode(10));
  </script>
</body>
</html>

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Lodash _.toNumber — prefixes (Try It)