containsKey method - SplayTreeMap class - dart:collection library (original) (raw)

bool containsKey(

1. Object? key )

override

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) => _untypedLookup(key) != null;