MapBase<K, V> class abstract mixin

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.

Implemented types
Implementers

Constructors

MapBase()
const

Properties

entries → Iterable<MapEntry<K, V>>
The map entries of this.
read-onlyoverride
hashCode → int
The hash code for this object.
read-onlyinherited
isEmpty → bool
Whether there is no key/value pair in the map.
read-onlyoverride
isNotEmpty → bool
Whether there is at least one key/value pair in the map.
read-onlyoverride
keys → Iterable<K>
The keys of this.
read-onlyoverride
length → int
The number of key/value pairs in the map.
read-onlyoverride
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
values → Iterable<V>
The values of this.
read-onlyoverride

Methods

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

Operators

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

Static Methods

mapToString(Map<Object?, Object?> m) → String