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