dart:collection
SplayTreeMap<K, V> class
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) ])
factory
- Creates a SplayTreeMap that contains all key/value pairs of
other. [...] - SplayTreeMap.fromIterable(Iterable iterable, { K key(dynamic element), V value(dynamic element), int compare(K key1, K key2), bool isValidKey(dynamic potentialKey) })
factory
- Creates a SplayTreeMap where the keys and values are computed from the
iterable. [...] - SplayTreeMap.fromIterables(Iterable<K> keys, Iterable<V> values, [ int compare(K key1, K key2), bool isValidKey(dynamic potentialKey) ])
factory
- Creates a SplayTreeMap associating the given
keys to values. [...] - SplayTreeMap.of(Map<K, V> other, [ int compare(K key1, K key2), bool isValidKey(dynamic potentialKey) ])
factory
- Creates a SplayTreeMap that contains all key/value pairs of
other.
Properties
- isEmpty → bool
read-only, override
- Returns true if there is no key/value pair in the map.
- isNotEmpty → bool
read-only, override
- Returns true if there is at least one key/value pair in the map.
- keys → Iterable<K>
read-only, override
- The keys of this. [...]
- length → int
read-only, override
- The number of key/value pairs in the map.
- values → Iterable<V>
read-only, override
- The values of this. [...]
- entries → Iterable<MapEntry<K, V>>
read-only, inherited
- The map entries of this.
- hashCode → int
read-only, inherited
- The hash code for this object. [...]
- runtimeType → Type
read-only, inherited
- A representation of the runtime type of the object.
Methods
- addAll(Map<K, V> other) → void
override
- Adds all key/value pairs of
other to this map. [...] - clear() → void
override
- Removes all pairs from the map. [...]
- containsKey(Object key) → bool
override
- Returns true if this map contains the given
key. [...] - containsValue(Object value) → bool
override
- Returns true if this map contains the given
value. [...] - 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
override
- Applies
f to each key/value pair of the map. [...] - 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. - putIfAbsent(K key, V ifAbsent()) → V
override
- Look up the value of
key, or add a new value if it isn't there. [...] - remove(Object key) → V
override
- Removes
key and its associated value, if present, from the map. [...] - addEntries(Iterable<MapEntry<K, V>> newEntries) → void
inherited
- Adds all key/value pairs of
newEntries to this map. [...] - cast<RK, RV>() → Map<RK, RV>
inherited
- Provides a view of this map as having
RK keys and RV instances, if necessary. [...] - map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>
inherited
- Returns a new map where all entries of this map are transformed by the given
f function. - noSuchMethod(Invocation invocation) → dynamic
inherited
- Invoked when a non-existent method or property is accessed. [...]
- removeWhere(bool test(K key, V value)) → void
inherited
- Removes all entries of this map that satisfy the given
predicate. - toString() → String
inherited
- Returns 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 key) → V
override
- Returns the value for the given
key or null if key is not in the map. [...] - operator []=(K key, V value) → void
override
- Associates the
key with the given value. [...] - operator ==(dynamic other) → bool
inherited
- The equality operator. [...]