PersistentHashMap<K extends Object, V> class

A collection of key/value pairs which provides efficient retrieval of value by key.

This class implements a persistent map: extending this map with a new key/value pair does not modify an existing instance but instead creates a new instance.

Unlike Map, this class does not support null as a key value and implements only a functionality needed for a specific use case at the core of the framework.

Underlying implementation uses a variation of hash array mapped trie data structure with compressed (bitmap indexed) nodes.

See also:


Creates an empty hash map.


hashCode int
The hash code for this object.
no setterinherited
runtimeType Type
A representation of the runtime type of the object.
no setterinherited


noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
put(K key, V value) PersistentHashMap<K, V>
If this map does not already contain the given key to value mapping then create a new version of the map which contains all mappings from the current one plus the given key to value mapping.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.
operator [](K key) → V?
Returns value associated with the given key or null if key is not in the map.