class
LinkedHashMap<K, V>

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.operator== 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

Properties

bool isEmpty
read-only , inherited
Returns true if there is no key-value pair in the map.
Iterable<K> keys
read-only , inherited
The keys of [this].
Iterable<V> values
read-only , inherited
The values of [this].
int length
read-only , inherited
The number of key-value pairs in the map.
bool isNotEmpty
read-only , inherited
Returns true if there is at least one key-value pair in the map.

Constructors

LinkedHashMap({bool equals(K key1, K key2), int hashCode(K key), bool isValidKey(potentialKey)})
Creates an insertion-ordered hash-table based Map.
LinkedHashMap.identity()
Creates an insertion-ordered identity-based map.
LinkedHashMap.from(Map other)
Creates a LinkedHashMap that contains all key value pairs of other.
LinkedHashMap.fromIterable(Iterable iterable, {K key(element), V value(element)})
Creates a LinkedHashMap where the keys and values are computed from the iterable.
LinkedHashMap.fromIterables(Iterable<K> keys, Iterable<V> values)
Creates a LinkedHashMap associating the given keys to values.

Operators

operator []=(K key, V value) → void
inherited
Associates the key with the given value.
operator [](Object key) → V
inherited
Returns the value for the given key or null if key is not in the map.

Methods

containsValue(Object value) → bool
inherited
Returns true if this map contains the given value.
remove(Object key) → V
inherited
Removes key and its associated value, if present, from the map.
clear() → void
inherited
Removes all pairs from the map.
containsKey(Object key) → bool
inherited
Returns true if this map contains the given key.
addAll(Map<K,V> other) → void
inherited
Adds all key-value pairs of other to this map.
forEach(void f(K key, V value)) → void
inherited
Applies f to each key-value pair of the map.
putIfAbsent(K key, V ifAbsent()) → V
inherited
Look up the value of key, or add a new value if it isn't there.