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## Get Length
### Instructions
Create a `getLength` function that takes an array or a string
and return its length.
### Notions
- [https://nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
- [https://nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)