dart:collection
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
- entries → Iterable<MapEntry<K, V>>
read-only, override
- The map entries of this.
- hashCode → int
read-only, inherited
- The hash code for this object.
- isEmpty → bool
read-only, override
- Whether there is no key/value pair in the map.
- isNotEmpty → bool
read-only, override
- Whether there is at least one key/value pair in the map.
- keys → Iterable<K>
read-only, override
- The keys of this.
- length → int
read-only, override
- 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, override
- The values of this.
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 entries from the map.
- containsKey(Object? key) → bool
override
- Whether this map contains the given
key. - containsValue(Object? value) → bool
override
- Whether this map contains the given
value. - forEach(void action(K key, V value)) → void
override
- Applies
action 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
convert function. - noSuchMethod(Invocation invocation) → dynamic
inherited
- Invoked when a non-existent method or property is accessed.
- putIfAbsent(K key, V ifAbsent()) → V
override
- Look up the value of
key, or add a new entry 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
test. - toString() → String
override
- 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.
Operators
- operator ==(Object other) → bool
inherited
- The equality operator.
- operator [](Object? key) → V?
override
- 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.