Swift 3比较数组索引 [英] Swift 3 comparing array indexes

问题描述

如果我有两个数组&我想比较一下它们的索引，例如：

If i have two arrays & i want to compare their indexes, for ex:

let var a1 = ["1", "2", "3"]
let var a2 = ["3", "2", "3"]

我想打印出一些内容来说明哪个索引不相同，例如：

And i wanted to print something to say which index wasn't the same, such as:

if a1[0] != a2[0] && a1[1] == a2[1] && a1[2] == a2[2]{
print("Index 0 is not the same.")

我是否还要再编写7条语句以显示所有8种可能性，即所有正确/全部错误/索引1& 1错误，等等？

Would i have to write 7 more of those statements to show all 8 possibilities of all correct/all wrong/index 1&1 wrong, etc?

谢谢！

推荐答案

您可以获得所有这样的索引：

You can get all indexes like this:

let diffIndex = zip(a1, a2).enumerated().filter {$1.0 != $1.1}.map {$0.offset}

说明：

• zip 产生一对序列


• enumerated（）向该序列添加索引


• 过滤器仅保留具有不同值的对


• map

• zip produces a sequence of pairs
• enumerated() adds an index to the sequence
• filter keeps only pairs with different values
• map harvests the index, and builds the sequence of results.

在其上运行

let a1 = ["1", "2", "3", "4"]
let a2 = ["3", "2", "3", "5"]

这将产生一个序列 [0，3]

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