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MapMixin<K, V> class

Mixin implementing a Map.

This mixin has a basic implementation of all but five of the members of Map. A basic Map class can be implemented by mixin in 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.

Implemented types
Implementers

Constructors

MapMixin()

Properties

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

Methods

addAll(Map<K, V> other) → void
override
Adds all key/value pairs of other to this map. [...]
addEntries(Iterable<MapEntry<K, V>> newEntries) → void
override
Adds all key/value pairs of newEntries to this map. [...]
cast<RK, RV>() → Map<RK, RV>
override
Provides a view of this map as having RK keys and RV instances, if necessary. [...]
clear() → void
override
Removes all pairs from the map. [...]
containsKey(Object key) → bool
override
Returns true if this map contains the given key. [...]
containsValue(Object value) → bool
override
Returns true if this map contains the given value. [...]
forEach(void action(K key, V value)) → void
override
Applies f to each key/value pair of the map. [...]
map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>
override
Returns a new map where all entries of this map are transformed by the given f function.
putIfAbsent(K key, V ifAbsent()) → V
override
Look up the value of key, or add a new value if it isn't there. [...]
remove(Object key) → V
override
Removes key and its associated value, if present, from the map. [...]
removeWhere(bool test(K key, V value)) → void
override
Removes all entries of this map that satisfy the given predicate.
toString() → String
override
Returns a string representation of this object.
update(K key, V update(V value), { V ifAbsent() }) → V
override
Updates the value for the provided key. [...]
updateAll(V update(K key, V value)) → void
override
Updates all values. [...]
noSuchMethod(Invocation invocation) → dynamic
inherited
Invoked when a non-existent method or property is accessed. [...]

Operators

operator [](Object key) → V
override
Returns the value for the given key or null if key is not in the map. [...]
operator []=(K key, V value) → void
override
Associates the key with the given value. [...]
operator ==(dynamic other) → bool
inherited
The equality operator. [...]

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-collection/MapMixin-class.html