Kotlin-从数组中删除重复字符串的惯用方式? [英] Kotlin - Idiomatic way to remove duplicate strings from array?

问题描述

如何从Kotlin的Array<String?>中删除重复项?

How to remove duplicates from an Array<String?> in kotlin?

推荐答案

使用 distinct扩展功能:

Use the distinct extension function:

val a = arrayOf("a", "a", "b", "c", "c")
val b = a.distinct() // ["a", "b", "c"]

还有 distinctBy函数允许您指定如何区分项目:

There's also distinctBy function that allows one to specify how to distinguish the items:

val a = listOf("a", "b", "ab", "ba", "abc")
val b = a.distinctBy { it.length } // ["a", "ab", "abc"]

按照 @ mfulton26 的建议，您也可以使用

As @mfulton26 suggested, you can also use toSet, toMutableSet and, if you don't need the original ordering to be preserved, toHashSet. These functions produce a Set instead of a List and should be a little bit more efficient than distinct.

您可能会发现有用:

• 科林语成语
• 什么是Java 8标准Kotlin库中是否提供Stream.collect等效项?

• Kotlin idioms
• What Java 8 Stream.collect equivalents are available in the standard Kotlin library?

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