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 ==.

The map allows null as a key.

Implements

Constructors

LinkedHashMap({bool equals(K key1, K key2), int hashCode(K key), bool isValidKey(potentialKey) })

Creates an insertion-ordered hash-table based Map.

factory
LinkedHashMap.from(Map other)

Creates a LinkedHashMap that contains all key value pairs of other.

factory
LinkedHashMap.fromIterable(Iterable iterable, { K key(element), V value(element) })

Creates a LinkedHashMap where the keys and values are computed from the iterable.

factory
LinkedHashMap.fromIterables(Iterable<K> keys, Iterable<V> values)

Creates a LinkedHashMap associating the given keys to values.

factory
LinkedHashMap.identity()

Creates an insertion-ordered identity-based map.

factory

Properties

hashCode → int

The hash code for this object.

read-only, inherited
isEmpty → bool

Returns true if there is no key-value pair in the map.

read-only, inherited
isNotEmpty → bool

Returns true if there is at least one key-value pair in the map.

read-only, inherited
keys → Iterable<K>

The keys of this.

read-only, inherited
length → int

The number of key-value pairs in the map.

read-only, inherited
runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited
values → Iterable<V>

The values of this.

read-only, inherited

Operators

operator ==(other) → bool

The equality operator.

inherited
operator [](Object key) → V

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

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

Associates the key with the given value.

inherited

Methods

addAll(Map<K, V> other) → void

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

inherited
clear() → void

Removes all pairs from the map.

inherited
containsKey(Object key) → bool

Returns true if this map contains the given key.

inherited
containsValue(Object value) → bool

Returns true if this map contains the given value.

inherited
forEach(void f(K key, V value)) → void

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

inherited
noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited
putIfAbsent(K key, V ifAbsent()) → V

Look up the value of key, or add a new value if it isn't there.

inherited
remove(Object key) → V

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

inherited
toString() → String

Returns a string representation of this object.

inherited