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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>property — vs method</title>
</head>
<body>
  <h1>property vs method</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var objects = [
      { a: { b: _.constant(2) } },
      { a: { b: _.constant(1) } }
    ];
    var lines = [
      "property → " +
        JSON.stringify(
          _.map(objects, _.property("a.b")).map(function (fn) {
            return typeof fn;
          })
        ),
      "method → " + JSON.stringify(_.map(objects, _.method("a.b")))
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Lodash _.property — vs method (Try It)