SplayTreeMap<K, V> class Null safety

A Map of objects that can be ordered relative to each other.

The map is based on a self-balancing binary tree. It allows most operations in amortized logarithmic time.

Keys of the map are compared using the compare function passed in the constructor, both for ordering and for equality. If the map contains only the key a, then map.containsKey(b) will return true if and only if compare(a, b) == 0, and the value of a == b is not even checked. If the compare function is omitted, the objects are assumed to be Comparable, and are compared using their Comparable.compareTo method. Non-comparable objects (including null) will not work as keys in that case.

To allow calling operator [], remove or containsKey with objects that are not supported by the compare function, an extra isValidKey predicate function can be supplied. This function is tested before using the compare function on an argument value that may not be a K value. If omitted, the isValidKey function defaults to testing if the value is a K.

Mixed in types

Constructors

SplayTreeMap([int compare(K key1, K key2), bool isValidKey(dynamic potentialKey)])
SplayTreeMap.from(Map other, [int compare(K key1, K key2), bool isValidKey(dynamic potentialKey)])
Creates a SplayTreeMap that contains all key/value pairs of other. [...]
factory
SplayTreeMap.fromIterable(Iterable iterable, {K key(dynamic element), V value(dynamic element), int compare(K key1, K key2), bool isValidKey(dynamic potentialKey)})
Creates a SplayTreeMap where the keys and values are computed from the iterable. [...]
factory
SplayTreeMap.fromIterables(Iterable<K> keys, Iterable<V> values, [int compare(K key1, K key2), bool isValidKey(dynamic potentialKey)])
Creates a SplayTreeMap associating the given keys to values. [...]
factory
SplayTreeMap.of(Map<K, V> other, [int compare(K key1, K key2), bool isValidKey(dynamic potentialKey)])
Creates a SplayTreeMap that contains all key/value pairs of other.
factory

Properties

entries → Iterable<MapEntry<K, V>>
The map entries of this.
read-only, inherited
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, override
isNotEmpty → bool
Returns true if there is at least one key/value pair in the map.
read-only, override
keys → Iterable<K>
The keys of this. [...]
read-only, override
length → int
The number of key/value pairs in the map.
read-only, override
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
values → Iterable<V>
The values of this. [...]
read-only, override

Methods

addAll(Map<K, V> other) → void
Adds all key/value pairs of other to this map. [...]
override
addEntries(Iterable<MapEntry<K, V>> newEntries) → void
Adds all key/value pairs of newEntries to this map. [...]
inherited
cast<RK, RV>() → Map<RK, RV>
Provides a view of this map as having RK keys and RV instances, if necessary. [...]
inherited
clear() → void
Removes all pairs from the map. [...]
override
containsKey(Object? key) → bool
Returns true if this map contains the given key. [...]
override
containsValue(Object? value) → bool
Returns true if this map contains the given value. [...]
override
firstKey() → K?
Get the first key in the map. Returns null if the map is empty.
firstKeyAfter(K key) → K?
Get the first key in the map that is strictly larger than key. Returns null if no key was not found.
forEach(void f(K key, V value)) → void
Applies f to each key/value pair of the map. [...]
override
lastKey() → K?
Get the last key in the map. Returns null if the map is empty.
lastKeyBefore(K key) → K?
Get the last key in the map that is strictly smaller than key. Returns null if no key was not found.
map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>
Returns a new map where all entries of this map are transformed by the given f function.
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. [...]
override
remove(Object? key) → V?
Removes key and its associated value, if present, from the map. [...]
override
removeWhere(bool test(K key, V value)) → void
Removes all entries of this map that satisfy the given predicate.
inherited
toString() → String
Returns a string representation of this object.
inherited
update(K key, V update(V value), {V ifAbsent()}) → V
Updates the value for the provided key. [...]
inherited
updateAll(V update(K key, V value)) → void
Updates all values. [...]
inherited

Operators

operator ==(Object 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. [...]
override
operator []=(K key, V value) → void
Associates the key with the given value. [...]
override