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