description

# containsValue method

bool containsValue(

1. Object? value

)
override

Whether this map contains the given `value`.

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

    final moonCount = <String, int>{'Mercury': 0, 'Venus': 0, 'Earth': 1,
      'Mars': 2, 'Jupiter': 79, 'Saturn': 82, 'Uranus': 27, 'Neptune': 14};
    final moons3 = moonCount.containsValue(3); // false
    final moons82 = moonCount.containsValue(82); // true

## Implementation

    bool containsValue(Object? value) {
      int initialSplayCount = _splayCount;
      bool visit(_SplayTreeMapNode<K, V>? node) {
        while (node != null) {
          if (node.value == value) return true;
          if (initialSplayCount != _splayCount) {
            throw ConcurrentModificationError(this);
          }
          if (node._right != null && visit(node._right)) {
            return true;
          }
          node = node._left;
        }
        return false;
      }

      return visit(_root);
    }