MapBase class - dart:collection library (original) (raw)

Base class for implementing a Map.

This class has a basic implementation of all but five of the members ofMap. 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 andIterable.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

• Map<K, V>

Implementers

• AudioParamMap
• MidiInputMap
• MidiOutputMap
• RtcStatsReport
• SplayTreeMap
• Storage
• UnmodifiableMapBase

Constructors

MapBase()

const

Properties

entries → Iterable<MapEntry<K, V>>

The map entries of this Map.

no setteroverride

hashCode → int

The hash code for this object.

no setterinherited

isEmpty → bool

Whether there is no key/value pair in the map.

no setteroverride

isNotEmpty → bool

Whether there is at least one key/value pair in the map.

no setteroverride

keys → Iterable<K>

The keys of this Map.

no setteroverride

length → int

The number of key/value pairs in the map.

no setteroverride

runtimeType → Type

A representation of the runtime type of the object.

no setterinherited

values → Iterable<V>

The values of this Map.

no setteroverride

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