remove method

  1. @override
V remove(
  1. Object key
)
override

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.

final terrestrial = <int, String>{1: 'Mercury', 2: 'Venus', 3: 'Earth'};
final removedValue = terrestrial.remove(2); // Venus
print(terrestrial); // {1: Mercury, 3: Earth}

Implementation

@override
V remove(Object key) {
  if (_isReadonly) {
    throw UnsupportedError('Attempted to change a read-only map field');
  }
  return _wrappedMap.remove(key);
}