dart:collection
MapBase<K, V> 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 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.
- Inheritance
- Implemented by
Constructors
- MapBase()
Properties
- entries → Iterable<MapEntry<K, V>>
read-only, inherited
- The map entries of this.
- hashCode → int
read-only, inherited
- The hash code for this object. [...]
- isEmpty → bool
read-only, inherited
- Returns true if there is no key/value pair in the map.
- isNotEmpty → bool
read-only, inherited
- Returns true if there is at least one key/value pair in the map.
- keys → Iterable<K>
read-only, inherited
- The keys of this. [...]
- length → int
read-only, inherited
- 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, inherited
- The values of this. [...]
Methods
- addAll(Map<K, V> other) → void
inherited
- Adds all key/value pairs of
other to this map. [...] - addEntries(Iterable<MapEntry<K, V>> newEntries) → void
inherited
- Adds all key/value pairs of
newEntries to this map. [...] - cast<RK, RV>() → Map<RK, RV>
inherited
- Provides a view of this map as having
RK keys and RV instances, if necessary. [...] - 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. [...] - map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>
inherited
- Returns a new map where all entries of this map are transformed by the given
f function. - 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. [...] - removeWhere(bool test(K key, V value)) → void
inherited
- Removes all entries of this map that satisfy the given
predicate. - toString() → String
inherited
- Returns a string representation of this object.
- update(K key, V update(V value), { V ifAbsent() }) → V
inherited
- Updates the value for the provided
key. [...] - updateAll(V update(K key, V value)) → void
inherited
- Updates all values. [...]
Operators
- operator ==(dynamic 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) → void
inherited
- Associates the
key with the given value. [...]
Static Methods
- mapToString(Map m) → String