containsValue method Null safety

bool containsValue (
  1. Object? value
)
override

Returns true if this map contains the given value.

Returns true if any of the values in the map are equal to value according to the == operator.

Implementation

bool containsValue(Object? value) {
  for (K key in keys) {
    if (this[key] == value) return true;
  }
  return false;
}