## Title

### Instruction

Implement 2 functions:
- `split` that works like the string method `.split` but take the string as
  it's first argument.

- `join` that works like the string method `.split` but take the array as
  it's first argument.


### Notions

- https://devdocs.io/javascript/global_objects/array/join
- https://devdocs.io/javascript/global_objects/string/split


### Code provided
```js
String.prototype.split = undefined
String.prototype.match = undefined
RegExp.prototype.exec = undefined
Array.prototype.join = undefined
```