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  <title>Lodash _.invertBy - group by value</title>
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  <h1>_.invertBy - group source keys by value</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var items = {
        apple: "fruit",
        banana: "fruit",
        carrot: "vegetable"
      };
      var scores = { A: 1, B: 2, C: 1, D: 3 };
      var lines = [
        "items  : " + JSON.stringify(_.invertBy(items)),
        "scores : " + JSON.stringify(_.invertBy(scores))
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.invertBy - group source keys by value (Try It)