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## Abs
### Instructions
Create a function named `isPositive` that takes a number as a argument, returning `true` if the number is strictly positive, and `false` otherwise.
Create a function named `abs` that takes a number as an argument and returns its absolute value. You must make your own implementation. You **must not** use `Math.abs()` .
### Notions
- [Functions ](https://nan-academy.github.io/js-training/examples/functions.js )
- [Ternary ](https://nan-academy.github.io/js-training/examples/ternary.js )
- [Math.abs ](https://devdocs.io/javascript/global_objects/math/abs )
### Code provided
> The provided code will be added to your solution, and does not need to be submitted.
```js
Math.abs = undefined
```
