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## Last First Kiss
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### Instructions
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Create 3 functions:
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- a `first` function that takes an array or a string
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and return the first element.
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- a `last` function that takes an array or a string
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and return the last element.
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- a `kiss` function that returns an array of 2 elements
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the last and the first element, in that order
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### Notions
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- [nan-academy.github.io/js-training/examples/data-structures.js](https://nan-academy.github.io/js-training/examples/data-structures.js)
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- [nan-academy.github.io/js-training/examples/get.js](https://nan-academy.github.io/js-training/examples/get.js)
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