public/subjects/mapper/README.md

## 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

- [devdocs.io/javascript/global_objects/array/map](https://devdocs.io/javascript/global_objects/array/map)
- [devdocs.io/javascript/global_objects/array/flatmap](https://devdocs.io/javascript/global_objects/array/flatmap)

### Code provided

> all code provided will be added to your solution and doesn't need to be submited.

```js
Array.prototype.map = undefined
Array.prototype.flatMap = undefined
Array.prototype.flat = undefined
```