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<head>
  <meta charset="utf-8">
  <title>Lodash conformsTo — one rule</title>
</head>
<body>
  <h1>_.conformsTo — single predicate</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var user = { age: 21, country: "US" };
      var rules = {
        age: function (n) {
          return n >= 18;
        }
      };
      document.getElementById("out").textContent =
        "passesAgeRule: " + _.conformsTo(user, rules);
    })();
  </script>
</body>
</html>

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Lodash _.conformsTo — age rule (Try It)