Union two arrays
两个数组的并集
union([1, 2, 3], [2, 4, 5, 6]) // => [1, 2, 3, 4, 5, 6]union([1, 2], [3, 4]) // => [] Copy
union([1, 2, 3], [2, 4, 5, 6]) // => [1, 2, 3, 4, 5, 6]union([1, 2], [3, 4]) // => []
Union two arrays
两个数组的并集