如何检查一个数组是否包含另一个数组的值? [英] How can I check if an array contains a value of another array?

问题描述

我想检查一个数组是否包含另一个数组的值.例如，我想检查数组A是否包含来自数组B的值.

I would like to check to see if an array contains a value from another array. For example, I would like to check if the array A contains a value from an array B.

我正在寻找任何值，而不是一个特定值.

I'm looking for any value not one specific value.

推荐答案

如果要查看两个数组之间是否有任何重叠，可以执行以下操作:

If you're wanting to see if there is any overlap at all between two arrays, you can do this:

fun Array<*>.intersects(other: Array<*>) = any { it in other }

如下面的评论中所述，这是O(n ^ 2)，因此对于大型数组，建议:

As mentioned in the comments below, this is O(n^2) so with large arrays, prefer:

fun Array<*>.intersects(other: Array<*>) = intersect(other.toSet()).isNotEmpty()

仅当第二个集合是数组而不是类似List的Iterable时，才需要

toSet().

toSet() is only needed if the second collection is an Array rather than an Iterable like List.

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