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  <title>Lodash _.invertBy - custom buckets</title>
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  <h1>_.invertBy - custom buckets via iteratee</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var fruits = {
        1: "apple",
        2: "banana",
        3: "orange"
      };
      var orders = {
        o1: 42,
        o2: 7,
        o3: 105,
        o4: 23
      };
      var byLength = _.invertBy(fruits, function (name) { return name.length; });
      var bySize   = _.invertBy(orders, function (amount) { return amount >= 50 ? "large" : "small"; });
      var lines = [
        "by length : " + JSON.stringify(byLength),
        "by size   : " + JSON.stringify(bySize)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.invertBy - custom buckets with an iteratee (Try It)