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app/code/node_modules/collect.js/docs/api/countBy.md

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+# `countBy()`
+
+The countBy method counts the occurences of values in the collection. By default, the method counts the occurrences of every element:
+
+```js
+const collection = collect([1, 2, 2, 2, 3]);
+
+const counted = collection.countBy();
+
+counted.all();
+
+// {
+//   1: 1,
+//   2: 3,
+//   3: 1,
+// }
+```
+
+However, you pass a callback to the countBy method to count all items by a custom value:
+
+```js
+const collection = collect([
+  'mohamed.salah@gmail.com',
+  'sadio.mane@yahoo.com',
+  'roberto.firmino@gmail.com',
+]);
+
+const counted = collection.countBy(email => email.split('@')[1]);
+
+counted.all();
+
+// {
+//   'gmail.com': 2,
+//   'yahoo.com': 1,
+// }
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/countBy.js)