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## Sign
### Instructions
Create a function named `sign` that takes one number argument; returning `1` if the number is positive, `-1` if the number is negative and `0` if the number is exactly 0.
> You must not just use `Math.sign`, make your own.
Create a function named `sameSign` that takes 2 numbers as arguments and returns `true` if they both have the same sign, or false otherwise.
### Notions
- [Functions ](https://nan-academy.github.io/js-training/examples/functions.js )
- [If-else ](https://nan-academy.github.io/js-training/examples/if-else.js )
- [Math.sign ](https://devdocs.io/javascript/global_objects/math/sign )
### Code provided
> The provided code will be added to your solution, and does not need to be submitted.
```js
Math.sign = undefined
```
