Add puzzlers for ConcurrentHashMap and Hashtable.contains(Object)

angryziber / kotlin-puzzlers

A collection of Kotlin Puzzlers

422 stars 58 forks source link

Add puzzlers for ConcurrentHashMap and Hashtable.contains(Object) #78

Open Marcono1234 opened 3 years ago

Marcono1234 commented 3 years ago

Add puzzlers for the counterintuitive behavior of ConcurrentHashMap and Hashtable (respectively its subclass Properties) contains(Object) which checks if a value is contained.

Puzzler 1 is about the conflict with the Map.contains(K) extension function
Puzzler 2 is about its interaction with the in operator