使用“地图”在Swift中创建两个阵列的超集 [英] Using "Map" in Swift To Create Superset of Two Arrays

问题描述

假设我有两个数组：

let letterArray = ["a", "b", "c", "d", "e"...]
let numberArray = [1, 2, 3, 4, 5, 6, 7...]

我想合并两个数组，以便得到

I want to combine the two arrays so that I would get an output of

["a1", "b2", "c3", "d4", "e5"]

我该如何做？

推荐答案

你可以使用 zip（_：在地图之前_：） ：

You can use zip(_:_:) before map:

let a = ["a", "b", "c", "d", "e"]
let b = [1, 2, 3, 4, 5]

let result = zip(a, b).map{$0 + String($1)}

print(result) // => ["a1", "b2", "c3", "d4", "e5"]

您可以在此处试用此代码。

zip（_：_：） 生成自定义 Zip2Sequence ，它具有 SequenceType 协议，以便它迭代从两个源集合中生成的对。

zip(_:_:) produces a custom Zip2Sequence, which has a special implmentation of the SequenceType protocol, so that it iterates pairs made from the two source collections.

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