MapBase<K, V> class
Base class for implementing a Map.
This class has a basic implementation of all but five of the members of Map. A basic Map class can be implemented by extending this class and implementing keys, operator[], operator[]=, remove and clear. The remaining operations are implemented in terms of these five.
The keys iterable should have efficient Iterable.length and Iterable.contains operations, and it should catch concurrent modifications of the keys while iterating.
A more efficient implementation is usually possible by overriding some of the other members as well.
- Inheritance
- Implementers
Constructors
- MapBase()
Properties
- entries → Iterable<
MapEntry< K, V> >read-only, inherited - The map entries of this.
- hashCode → int read-only, inherited
- The hash code for this object. [...]
- isEmpty → bool read-only, inherited
- Whether there is no key/value pair in the map.
- isNotEmpty → bool read-only, inherited
- Whether there is at least one key/value pair in the map.
- keys → Iterable<
K> read-only, inherited - The keys of this. [...]
- length → int read-only, inherited
- The number of key/value pairs in the map.
- runtimeType → Type read-only, inherited
- A representation of the runtime type of the object.
- values → Iterable<
V> read-only, inherited - The values of this. [...]
Methods
- addAll(
Map< K, V> other) → voidinherited - Adds all key/value pairs of
otherto this map. [...] - addEntries(
Iterable< MapEntry< newEntries) → voidK, V> >inherited - Adds all key/value pairs of
newEntriesto this map. [...] - cast<
RK, RV> () → Map< RK, RV> inherited - Provides a view of this map as having
RKkeys andRVinstances, if necessary. [...] - clear(
) → void inherited - Removes all entries from the map. [...]
- containsKey(
Object? key) → bool inherited - Whether this map contains the given
key. [...] - containsValue(
Object? value) → bool inherited - Whether this map contains the given
value. [...] - forEach(
void action(K key, V value)) → void inherited - Applies
actionto each key/value pair of the map. [...] - map<
K2, V2> (MapEntry< K2, V2> transform(K key, V value)) → Map<K2, V2> inherited - Returns a new map where all entries of this map are transformed by the given
convertfunction. - noSuchMethod(
Invocation invocation) → dynamic inherited - Invoked when a non-existent method or property is accessed. [...]
- putIfAbsent(
K key, V ifAbsent()) → V inherited - Look up the value of
key, or add a new entry if it isn't there. [...] - remove(
Object? key) → V? inherited - Removes
keyand its associated value, if present, from the map. [...] - removeWhere(
bool test(K key, V value)) → void inherited - Removes all entries of this map that satisfy the given
test. - toString(
) → String inherited - A string representation of this object. [...]
- update(
K key, V update(V value), {V ifAbsent()}) → V inherited - Updates the value for the provided
key. [...] - updateAll(
V update(K key, V value)) → void inherited - Updates all values. [...]
Operators
- operator ==(
Object other) → bool inherited - The equality operator. [...]
- operator [](
Object? key) → V? inherited - The value for the given
key, ornullifkeyis not in the map. [...] - operator []=(
K key, V value) → void inherited - Associates the
keywith the givenvalue. [...]
Static Methods
- mapToString(
Map< Object?, Object?> m) → String
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-collection/MapBase-class.html