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kotlinlang

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?

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


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

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

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 +=

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

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