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simona1@sfusd.edu mixedpractice1 > doubleElements
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Given an integer array nums, return a new array with a length of nums.length*2 where each element in nums appears twice in a row.


doubleElements([2, 3, 5, 4]) → [2, 2, 3, 3, 5, 5, 4, 4]
doubleElements([1, 2, 2, 3, 4, 4, 5, 6]) → [1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6]
doubleElements([1, 2, 3, 4, 5, 6]) → [1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6]

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public int[] doubleElements(int[] nums){ }

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