containsKey method - Map class - dart:core library (original) (raw)

containsKey abstract method

bool containsKey(

1. Object? key )

Whether this map contains the given key.

Returns true if any of the keys in the map are equal to keyaccording to the equality used by the map.

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

Implementation

bool containsKey(Object? key);