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Given an array and a key, return the index of the first element in the array that matches the key. If no element matches the key, return -1. find([5, 4, 5], 4) → 1 find([5, 4, 5], 5) → 0 find([5, 4, 5], 6) → -1 ...Save, Compile, Run (ctrl-enter)  | 
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Difficulty: 200
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