abstract fun remove(key: K): V? (source)

Removes the specified key and its corresponding value from this map.

Return the previous value associated with the key, or null if the key was not present in the map.

open fun remove(key: K, value: V): Boolean (source)

Platform and version requirements: Kotlin 1.1

Removes the entry for the specified key only if it is mapped to the specified value.

Return true if entry was removed