In Kotlin how do you test equivalence between two ...

# announcements

[Brian Norman]

In Kotlin how do you test equivalence between two Lists? i.e content is the same but not necessarily the same order?

[Dominaezzz]

If order is not important then what you describe is Set equivalence. list1.toSet() == list2.toSet().

[Dominaezzz]

Consider using LinkedHashSet if you need a set of values in insertion order.

[Brian Norman]

Thank you!

[Can Orhan]

Another consideration being listOf("a","a").size == setOf("a", "a").size // is false

[Chris Miller]

Using a set and size would still fail for listOf("a", "a", "b") vs listOf("a", "b", "b")

[Chris Miller]

Sort + compare might be more appropriate depending on your use case

[Kroppeb]

If sort is to slow, you can make a hashmap with item counts