Swift 4排序多维数组

假设所有子数组都包含6个元素,则可以使用元组(与6的arity相当)对数组进行排序:

let array = [[10, 2, 4, 10, 23, 56],
             [0, 12, 14, 20, 28, 42],
             [0, 2, 4, 10, 26, 54],
             [1, 24, 34, 40, 47, 51],
             [1, 23, 24, 30, 33, 50]]

let sorted = array.sorted(by: {
     ($0[0],$0[1],$0[2],$0[3],$0[4],$0[5]) < ($1[0],$1[1],$1[2],$1[3],$1[4],$1[5])
})
print(sorted) // [[0, 2, 4, 10, 26, 54],
              //  [0, 12, 14, 20, 28, 42],    
              //  [1, 23, 24, 30, 33, 50], 
              //  [1, 24, 34, 40, 47, 51],
              //  [10, 2, 4, 10, 23, 56]]