dart:collection

MapBase abstract 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 length and 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.

Mixes-in

• MapMixin<K, V>

Implemented by

• UnmodifiableMapBase

Constructors

MapBase()

Properties

hashCode → int

read-only, inherited

The hash code for this object.

isEmpty → bool

read-only, inherited

isNotEmpty → bool

read-only, inherited

keys → Iterable<K>

read-only, inherited

length → int

read-only, inherited

runtimeType → Type

read-only, inherited

A representation of the runtime type of the object.

values → Iterable<V>

read-only, inherited

Operators

operator ==(other) → bool

inherited

The equality operator.

operator [](Object key) → V

inherited

Returns the value for the given key or null if key is not in the map.

operator []=(K key, V value) → dynamic

inherited

Associates the key with the given value.

Methods

addAll(Map<K, V> other) → void

inherited

Adds all key-value pairs of other to this map.

clear() → void

inherited

Removes all pairs from the map.

containsKey(Object key) → bool

inherited

Returns true if this map contains the given key.

containsValue(Object value) → bool

inherited

Returns true if this map contains the given value.

forEach(void action(K key, V value)) → void

inherited

Applies f to each key-value pair of the map.

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 value if it isn't there.

remove(Object key) → V

inherited

Removes key and its associated value, if present, from the map.

toString() → String

inherited

Returns a string representation of this object.