合并 Swift 中的子数组

Question

我有一个数组，我想合并它。

这是数组：

let numbers = [ [ 1, 2, 3 ], [ 4, 5, 6 ] ]

我需要这样的输出：

let result = [ [ 1, 4 ], [ 2, 5 ], [ 3, 6 ] ]

Answer 1

你可以使用 zip 全局函数，给定 2 个序列，returns 一个元组序列，然后使用适当的 init 获得一个元组数组。

var xAxis = [1, 2, 3, 4]
var yAxis = [2, 3, 4, 5]
let pointsSequence = zip(xAxis, yAxis)
let chartPoints = Array(pointsSequence)
print(chartPoints)

然后您可以像这样访问元组：

let point = chartPoints[0]
point.0 // This is the 1st element of the tuple
point.1 // This is the 2nd element of the tuple

Answer 2

let numbers = [[1,2,3], [4,5,6]]

let result = zip(numbers[0], numbers[1]).map { [[=10=].0, [=10=].1]}

print(result) // -> [[1, 4], [2, 5], [3, 6]]

如果数组有更多元素，下面的方法就可以了。

let numbers = [[1,2,3], [4,5,6], [7,8,9]]

var result : [[Int]] = []

for n in 0...numbers.first!.count-1{
    result.append(numbers.compactMap { [=11=][n] })
}

print(result) // -> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]

合并 Swift 中的子数组

Merge sub-array in Swift

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