description

# 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) {
      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);
    }