Hi! Still learning functional things in Kotlin and...

# codereview

[zokipirlo]

Hi! Still learning functional things in Kotlin and would need some help. Can someone please check my example and tell me if this example can be done better? https://try.kotlinlang.org/#/UserProjects/h9ra2isjl4vudcq3mmo8gii4n8/fb6lvfgtq7ppf3es5tt36b5h0o
Thanks!
[moved from #general]

[hho]

I'm not sure what you're looking for, but I made https://pl.kotl.in/ry51qAM0m

[zokipirlo]

I was thinking if there exists any extra magical functional construct to do that in one step, not making multiple lists or maps 🙂
Thanks, looks much prettier solution

[arekolek]

You can also do:

users
    .filterNot { it.state == 5 }
    .groupingBy { it.id }
    .reduce { _, acc, user ->
        maxOf(acc, user, compareBy { it.state })
    }
    .values

[zokipirlo]

Thanks! Looks nicer and reduce is not nullable (mapValues is).

[edwardwongtl]

There is mapNotNull{} as a non-null version of map{}