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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',
'darwin.nunez@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)