Hello, how could I convert the bellow Swift code t...

# android

[Bill]

Hello, how could I convert the bellow Swift code to Kotlin? I'm coming from iOS and I use a Redux implementation for state management ("state")

state.list = state.list.map { listItem in
        if listItem.id == action.payload.id {
            var listItem = listItem
            listItem.title = action.payload.newTitle
            return listItem
          } else {
            return listItem
          }
        }

[kenkyee]

Replace the in with ->

[Bill]

@kenkyee I tried with -> but I receive error "Type Mismatch Required: ArrayList<>, found List<Unit>"

[kenkyee]

How did you define state.list?
Should not be arraylist

[Bill]

What should be? MutableList is better?

[mkrussel]

The lambda should not use returns. That is making the map function see the lambda as returning Unit.

As for the type of state.list . Ideally that would be of type List. If it needs to be mutable, then it should be MutableList and you will need to call toMutableList on the result of map.

[Bill]

@mkrussel I tried with List and removed "return" but no luck. Could you recreate my function?

[mkrussel]

state.list = state.list.map { listItem in
        if listItem.id == action.payload.id {
            var listItem = listItem
            listItem.title = action.payload.newTitle
            listItem
          } else {
            listItem
          }
        }

Although this is not really doing any mapping.

This is probably better to be in a basic for loop.