containsKey abstract method
Returns true
if this map contains the given key
.
Returns true
if any of the keys in the map are equal to key
according to the equality used by the map.
Implementation
bool containsKey(K? key);
Returns true
if this map contains the given key
.
Returns true
if any of the keys in the map are equal to key
according to the equality used by the map.
bool containsKey(K? key);