LinkedHashMap<K, V> class
A hash-table based implementation of Map.
The insertion order of keys is remembered, and keys are iterated in the order they were inserted into the map. Values are iterated in their corresponding key's order. Changing a key's value, when the key is already in the map, does not change the iteration order, but removing the key and adding it again will make it be last in the iteration order.
The keys of a LinkedHashMap must have consistent Object.== and Object.hashCode implementations. This means that the == operator must define a stable equivalence relation on the keys (reflexive, symmetric, transitive, and consistent over time), and that hashCode must be the same for objects that are considered equal by ==.
- Implemented types
-
-
Map<
K, V>
-
Map<
Constructors
- LinkedHashMap({bool equals(K, K), int hashCode(K), bool isValidKey(dynamic)}) factory
- Creates an insertion-ordered hash-table based Map. [...]
- LinkedHashMap.from(Map other) factory
- Creates a LinkedHashMap that contains all key value pairs of
other. [...] - LinkedHashMap.fromEntries(Iterable<
MapEntry< entries)K, V> >factory - Creates a LinkedHashMap containing the entries of
entries. [...] - LinkedHashMap.fromIterable(Iterable iterable, {K key(dynamic element), V value(dynamic element)}) factory
- Creates a LinkedHashMap where the keys and values are computed from the
iterable. [...] - LinkedHashMap.fromIterables(Iterable<
K> keys, Iterable<V> values)factory - Creates a LinkedHashMap associating the given
keystovalues. [...] - LinkedHashMap.identity() factory
- Creates an insertion-ordered identity-based map. [...]
- LinkedHashMap.of(Map<
K, V> other)factory - Creates a LinkedHashMap that contains all key value pairs of
other.
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
- Whether there is no key/value pair in the map.
- isNotEmpty → bool read-only, inherited
- Whether 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) → voidinherited - Adds all key/value pairs of
otherto this map. [...] - addEntries(
Iterable< MapEntry< newEntries) → voidK, V> >inherited - Adds all key/value pairs of
newEntriesto this map. [...] - cast<
RK, RV> () → Map< RK, RV> inherited - Provides a view of this map as having
RKkeys andRVinstances, if necessary. [...] - clear(
) → void inherited - Removes all entries from the map. [...]
- containsKey(
Object? key) → bool inherited - Whether this map contains the given
key. [...] - containsValue(
Object? value) → bool inherited - Whether this map contains the given
value. [...] - forEach(
void action(K key, V value)) → void inherited - Applies
actionto each key/value pair of the map. [...] - map<
K2, V2> (MapEntry< K2, V2> convert(K key, V value)) → Map<K2, V2> inherited - Returns a new map where all entries of this map are transformed by the given
convertfunction. - 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 entry if it isn't there. [...] - remove(
Object? key) → V? inherited - Removes
keyand 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
test. - toString(
) → String inherited - 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 ==(
Object other) → bool inherited - The equality operator. [...]
- operator [](
Object? key) → V? inherited - The value for the given
key, ornullifkeyis not in the map. [...] - operator []=(
K key, V value) → void inherited - Associates the
keywith the givenvalue. [...]
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-collection/LinkedHashMap-class.html