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

entriesIterable<MapEntry<K, V>>
read-only, inherited
The map entries of this.
hashCodeint
read-only, inherited
The hash code for this object. [...]
isEmptybool
read-only, inherited
Whether there is no key/value pair in the map.
isNotEmptybool
read-only, inherited
Whether there is at least one key/value pair in the map.
keysIterable<K>
read-only, inherited
The keys of this. [...]
lengthint
read-only, inherited
The number of key/value pairs in the map.
runtimeTypeType
read-only, inherited
A representation of the runtime type of the object.
valuesIterable<V>
read-only, inherited
The values of this. [...]

Methods

addAll(Map<K, V> other) → void
inherited
Adds all key/value pairs of other to this map. [...]
addEntries(Iterable<MapEntry<K, V>> newEntries) → void
inherited
Adds all key/value pairs of newEntries to this map. [...]
cast<RK, RV>() → Map<RK, RV>
inherited
Provides a view of this map as having RK keys and RV instances, 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 action to 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 convert function.
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 key and 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, or null if key is not in the map. [...]
operator []=(K key, V value) → void
inherited
Associates the key with the given value. [...]

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