ios - 在 Swift 中使用 "Map"创建两个数组的超集

Question

假设我有两个数组:

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

我想合并这两个数组，这样我会得到输出

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

我该怎么做呢？

Answer 1

您可以使用 zip(_:_:) map 前:

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"]

You can try this code here.

zip(_:_:)生成自定义 Zip2Sequence , 它有一个特殊的实现 SequenceType协议(protocol)，以便它迭代由两个源集合组成的对。