What is the best way to create a copy of a Map in ...

# coroutines

[Sanat Tripathi]

What is the best way to create a copy of a Map in Kotlin without causing ConcurrentModificationException in a multi-threaded environment?

I almost would like map.toMap() to happen atomically. I wanted to see whether something exists before creating my own synchronization blocks.

[mkrussel]

If targeting JVM, then you can use a ConcurrentHashMap.

[ephemient]

there isn't a way to atomically read an arbitrary map. but certain specific maps such as ConcurrentHashMap and CopyOnWriteMap (not standard, but exists in several libraries) support iteration during concurrent modification