Hi guys given I have a map like ```val myMap = sortedMapOf lt String Collection lt Int gt gt ``` Is there a way to put into the map and overflow in the collection in case the key already exist in the map

yeah I can use add but not += for some reasons but that s fine slightly smiling face

Hi guys given I have a map like ```val myMap = sortedMapOf l kotlinlang #getting-started

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Andrea Giuliano

10/13/2020, 4:10 PM

Hi guys, given I have a map like

val myMap = sortedMapOf<String, Collection<Int>>()

Is there a way to put into the map and overflow in the collection in case the key already exist in the map?

diesieben07

10/13/2020, 4:10 PM

myMap.getOrPut(key) { MyCollection() } += myValue

See here: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/get-or-put.html

Andrea Giuliano

10/13/2020, 4:12 PM

thanks!

nanodeath

10/13/2020, 4:23 PM

to perhaps state the obvious, make sure it's a mutable collection :)

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Andrea Giuliano

10/13/2020, 4:26 PM

only thing is, it seems I can’t really do

myMap.getOrPut(key) { MyCollection() } += myValue

kotlin expects that I put the list in a val before doing +=

diesieben07

10/13/2020, 4:30 PM

Make sure both your map and your collection are mutable. In my test it works fine: https://pl.kotl.in/psAZfS9uZ

Andrea Giuliano

10/13/2020, 4:30 PM

yeah I can use .add() but not += for some reasons, but that’s fine 🙂

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