CanonicalizedMap<C, K, V> class

A map whose keys are converted to canonical values of type C.

This is useful for using case-insensitive String keys, for example. It's more efficient than a LinkedHashMap with a custom equality operator because it only canonicalizes each key once, rather than doing so for each comparison.

Implemented types
Available extensions

Constructors

CanonicalizedMap.new(C canonicalize(K key), {bool isValidKey(K key)?})
Creates an empty canonicalized map.
CanonicalizedMap.from(Map<K, V> other, C canonicalize(K key), {bool isValidKey(K key)?})
Creates a canonicalized map that is initialized with the key/value pairs of other.
CanonicalizedMap.fromEntries(Iterable<MapEntry<K, V>> entries, C canonicalize(K key), {bool isValidKey(K key)?})
Creates a canonicalized map that is initialized with the key/value pairs of entries.

Properties

entries → Iterable<MapEntry<K, V>>
The map entries of this Map.
no setteroverride
hashCode → int
The hash code for this object.
no setterinherited
isEmpty → bool
Whether there is no key/value pair in the map.
no setteroverride
isNotEmpty → bool
Whether there is at least one key/value pair in the map.
no setteroverride
keys → Iterable<K>
The keys of this Map.
no setteroverride
length → int
The number of key/value pairs in the map.
no setteroverride
noneIfEmpty → Option<Map<K, V>>

Available on Map<K, V>, provided by the MapExt extension

Returns this map wrapped in a Some if it's not empty, otherwise returns None.
no setter
okValues → Map<K, V>

Available on Map<K, Result<V>>, provided by the MapOfResults extension

Returns a new map containing only the unwrapped values from Ok entries.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
someValues → Map<K, V>

Available on Map<K, Option<V>>, provided by the MapOfOptions extension

Returns a new map containing only the unwrapped values from Some entries.
no setter
values → Iterable<V>
The values of this Map.
no setteroverride

Methods

addAll(Map<K, V> other) → void
Adds all key/value pairs of other to this map.
override
addEntries(Iterable<MapEntry<K, V>> entries) → void
Adds all key/value pairs of newEntries to this map.
override
cast<K2, V2>() → Map<K2, V2>
Provides a view of this map as having RK keys and RV instances, if necessary.
override
clear() → void
Removes all entries from the map.
override
containsKey(Object? key) → bool
Whether this map contains the given key.
override
containsValue(Object? value) → bool
Whether this map contains the given value.
override
copy() → CanonicalizedMap<C, K, V>
Copies this CanonicalizedMap instance without recalculating the canonical values of the keys.
forEach(void f(K, V)) → void
Applies action to each key/value pair of the map.
override
getOption(K key) → Option<V>

Available on Map<K, V>, provided by the MapExt extension

Safely gets the value for a given key, returning an Option.
map<K2, V2>(MapEntry<K2, V2> transform(K, V)) → Map<K2, V2>
Returns a new map where all entries of this map are transformed by the given convert function.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
partition() → MapOptionPartition<K, V>

Available on Map<K, Option<V>>, provided by the MapOfOptions extension

Partitions the map into a record containing two maps: one for Some values and one for None values.
partition() → MapResultPartition<K, V>

Available on Map<K, Result<V>>, provided by the MapOfResults extension

Partitions the map into a record containing two maps: one for Ok values and one for Err values.
putIfAbsent(K key, V ifAbsent()) → V
Look up the value of key, or add a new entry 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 test.
override
retype<K2, V2>() → Map<K2, V2>
sequence() → Option<Map<K, V>>

Available on Map<K, Option<V>>, provided by the MapOfOptions extension

Turns a Map<K, Option<V>> into an Option<Map<K, V>>. If all values are Some, it returns a Some<Map<K, V>>. If any value is a None, it returns None.
sequence() → Result<Map<K, V>>

Available on Map<K, Result<V>>, provided by the MapOfResults extension

Turns a Map<K, Result<V>> into a Result<Map<K, V>>. If all values are Ok, it returns an Ok<Map<K, V>>. If any value is an Err, it returns the first Err encountered.
toMap() → Map<K, V>
Creates a Map<K,V> (with the original key values). See toMapOfCanonicalKeys.
toMapOfCanonicalKeys() → Map<C, V>
Creates a Map<C,V> (with the canonicalized keys). See toMap.
toString() → String
A string representation of this object.
override
update(K key, V update(V), {V ifAbsent()?}) → V
Updates the value for the provided key.
override
updateAll(V update(K key, V value)) → void
Updates all values.
override
whereErr() → Map<K, Err<V>>

Available on Map<K, Result<V>>, provided by the MapOfResults extension

Creates a new map containing only the entries where the value is an Err. The values in the new map are instances of Err<V>.
whereNone() → Map<K, None<V>>

Available on Map<K, Option<V>>, provided by the MapOfOptions extension

Creates a new map containing only the entries where the value is a None.
whereOk() → Map<K, Ok<V>>

Available on Map<K, Result<V>>, provided by the MapOfResults extension

Creates a new map containing only the entries where the value is an Ok. The values in the new map are instances of Ok<V>.
whereSome() → Map<K, Some<V>>

Available on Map<K, Option<V>>, provided by the MapOfOptions extension

Creates a new map containing only the entries where the value is a Some. The values in the new map are instances of Some<V>.

Operators

operator ==(Object other) → bool
The equality operator.
inherited
operator [](Object? key) → V?
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