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## Returns
### Instructions
Create the following functions:
- `id` that takes one argument and return it
- `getLength` that takes an array or a string and return its length
### Notions
- [nan-academy.github.io/js-training/examples/functions](https://nan-academy.github.io/js-training/examples/functions.js)
- [nan-academy.github.io/js-training/examples/data-structures](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [nan-academy.github.io/js-training/examples/get](https://nan-academy.github.io/js-training/examples/get.js)