remove method Null safety

String remove (
  1. dynamic key

Removes key and its associated value, if present, from the map.

Returns the value associated with key before it was removed. Returns null if key was not in the map.

Note that some maps allow null as a value, so a returned null value doesn't always mean that the key was absent.


String remove(dynamic key) {
  throw new UnsupportedError("Not supported");