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  <title>Lodash findIndex — match object</title>
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<body>
  <h1>Lodash _.findIndex — partial object</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var rows = [
        { id: 1, role: "guest" },
        { id: 2, role: "admin" }
      ];
      var idx = _.findIndex(rows, { id: 2 });
      document.getElementById("out").textContent = String(idx);
    })();
  </script>
</body>
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Lodash _.findIndex — partial object (Try It)