## Mapper

### Instructions

- Create a `map` function that takes an array as first argument, a function as second,
and that works like the method .map

- Create a `flatMap` function that takes an array as first argument, a function as second,
and that works like the method .flatMap


### Notions

- https://devdocs.io/javascript/global_objects/array/map
- https://devdocs.io/javascript/global_objects/array/flatmap


### Code provided
```js
Array.prototype.map = undefined
Array.prototype.flatMap = undefined
Array.prototype.flat = undefined
```