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# `macro()`
The macro method lets you register custom methods
```js
collect().macro('uppercase', function () {
return this.map(item => item.toUpperCase());
});
const collection = collect(['a', 'b', 'c']);
collection.uppercase();
collection.all();
// ['A', 'B', 'C']
```
> Note that the `macro` method returns `undefined`, and therefore it is not possible to use it within a chain of methods.
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/macro.js)