快速将嵌套数组转换为一维数组 [英] Convert nested array in swift to single dimensional array

问题描述

我有一个类似[[[ ]]]的结构，我想将其转换为[].

I have a structure like [[[ ]]] which I want to convert to [].

例如[ [ [ "Hi" ] ] ]转换为[ "Hi" ]

如何在Swift中执行此操作?

How can I do this in Swift?

推荐答案

joined() 返回(串联的)集合元素(的懒惰视图).可以重复应用 更深层的嵌套集合:

joined() returns (a lazy view of) the elements of an collection, concatenated. This can be applied repeatedly for deeper nested collections:

let arr = [ [ [ "A", "B" ], ["C"] ], [ [ "D", "E" ], ["F"] ] ]

let flattened = Array(arr.joined().joined())
print(flattened) // ["A", "B", "C", "D", "E", "F"]

外部Array()构造函数根据序列构建数组. 除此之外，不会创建任何中间数组.

The outer Array() constructor builds an array from the sequence. Apart from that, no intermediate arrays are created.

如果只想遍历嵌套数组，则联接 顺序就足够了:

If you just want to iterate over the nested array then the joined sequence is sufficient:

for elem in arr.joined().joined() {
    print(elem)
}

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