hi! ``` list.filter { it.field != null } .asso...

# getting-started

[poohbar]

hi!

list.filter { it.field != null }
    .associateBy({ it.id }, { it.field!! })

is there a way to avoid !! on the second line?
list is a list of:
data class Person(val id: String, val field: Field?)

[Dico]

Perhaps you can do mapNotNull to Pair? and then invoke .toMap()

[Pavlo Liapota]

Yes, something like this:

columns
    .mapNotNull { (id, direction) ->
        if (direction == null) null else id to direction
    }
    .toMap()

[Dico]

(id, dir) -> dir?.let { Pair(id, it) }

[Pavlo Liapota]

Even better 🙂

[Dico]

But i think the OP 's code is more readable

[karelpeeters]

Consider also whether this even matters, if you only use map.get a missing entry and a null value behave the same.

[Pavlo Liapota]

Also I prefer to use associate instead of associateBy in such cases:

.associate { it.id to it.direction!! }

[poohbar]

thank you all