Update index.js #8
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Shorter (5 lines to 2 lines), Clearer( logic: return the first element or a slice of the array), Less time ("slice()") and Less memory ( first: array -> n: number)
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Shorter (5 lines to 2 lines), Clearer( logic: return the first element or a slice of the array), Less time ("slice()") and Less memory ( first: array -> n: number)