## Last First Kiss

### Instructions

Create 3 functions:

- a `first` function that takes an array or a string
  and return the first element.

- a `last` function that takes an array or a string
  and return the last element.

- a `kiss` function that returns an array of 2 elements
  the last and the first element, in that order

### Notions

- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)