CodingBat swap

swap

Given an array and two positions within the array, swap elements in the array

swap([3, -2, 6, 9, -2, -3, 0], 0, 2) → [6, -2, 3, 9, -2, -3, 0]
swap([3, -2, 6, 9, -2, -3, 0], 0, 3) → [9, -2, 6, 3, -2, -3, 0]
swap([3, -2, 6, 9, -2, -3, 0], 2, 3) → [3, -2, 9, 6, -2, -3, 0]

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