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## Mapper
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### Instructions
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- Create a `map` function that takes an array as first argument, a function as second,
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and that works like the method .map
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- Create a `flatMap` function that takes an array as first argument, a function as second,
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and that works like the method .flatMap
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### Notions
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- [devdocs.io/javascript/global_objects/array/map](https://devdocs.io/javascript/global_objects/array/map)
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- [devdocs.io/javascript/global_objects/array/flatmap](https://devdocs.io/javascript/global_objects/array/flatmap)
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### Code provided
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```js
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Array.prototype.map = undefined
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Array.prototype.flatMap = undefined
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Array.prototype.flat = undefined
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```
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