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Ou are passed an array (similar to saying 'takes in an array' or 'given an array') containing strings. Working within that same array, replace each string with a number - the length of the string at the previous array index - and return the array. For example, previousLengths(["hello", "dojo", "awesome"]) should return ["hello", 5, 4]. Hint: Can for loops only go forward?

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