X1617: frontPiece extended

Given an int array nums of any length, return a new array of its first n elements. If the array is smaller than length n, use whatever elements are present. You can assume n is > than zero.

Examples:

frontPiece({3, 8, 13}, 1) -> {3}
frontPiece({3, 8, 13}, 2) -> {3,8}
frontPiece({3, 8, 13}, 3) -> {3,8,13}
frontPiece({3, 8, 13}, 5) -> {3,8,13}

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