sorting - Kotlin 的sortedBy 是否保持相等值的顺序？

Question

假设我有一个以任意顺序定义的值列表。

val list = listOf("a", "aa", "b", "bb")

如果我使用值的某些 Comparable 属性使用 sortedBy 对此列表进行排序。

val sorted = list.sortedBy { it.length }

对于比较相等的值，是否会保留原始任意顺序？

["a", "b", "aa", "bb"] // good
["b", "a", "aa", "bb"] // bad
["a", "b", "bb", "aa"] // bad
["b", "a", "bb", "aa"] // bad

Answer 1

是的，per the official docs :

The sort is stable. It means that equal elements preserve their order relative to each other after sorting.