CombinedMapView<K, V> class

Returns a new map that represents maps flattened into a single map.

All methods and accessors treat the new map as-if it were a single concatenated map, but the underlying implementation is based on lazily accessing individual map instances. In the occasion where a key occurs in multiple maps the first value is returned.

The resulting map has an index operator ([]) that is O(maps), rather than O(1), and the map is unmodifiable, but underlying changes to these maps are still accessible from the resulting map.

The length getter is O(M) where M is the total number of entries in all maps, since it has to remove duplicate entries.

Inheritance
Available extensions

Constructors

CombinedMapView(Iterable<Map<K, V>> _maps)
Create a new combined view of multiple maps.

Properties

$ → Signal<Map<K, V>>

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

Return a signal from a Map value
no setter
beautifiedJson → String

Available on Map<String, dynamic>, provided by the BeautifiedJson extension

Returns a beautified JSON string representation.
no setter
encodedJsonString → String

Available on Map<String, dynamic>, provided by the BeautifiedJsonMapExtension extension

no setter
encodeWithIndent → String

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

Convenience getter used by ConversionException.toString().
no setter
entries → Iterable<MapEntry<K, V>>
The map entries of this Map.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
isEmpty → bool
Whether there is no key/value pair in the map.
no setterinherited
isEmptyOrNull → bool

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

Returns true when the map is null or empty.
no setter
isNotEmpty → bool
Whether there is at least one key/value pair in the map.
no setterinherited
isNotEmptyOrNull → bool

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

Returns true when the map is non-null and not empty.
no setter
keys → Iterable<K>
The keys of this.
no setteroverride
keysList → List<K>

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

Returns a list containing all the keys in the map.
no setter
keysSet → Set<K>

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

Returns a set containing all the keys in the map.
no setter
length → int
The number of key/value pairs in the map.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
values → Iterable<V>
The values of this Map.
no setterinherited
valuesList → List<V>

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

Returns a list containing all the values in the map.
no setter
valuesSet → Set<V>

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

Returns a set containing all the values in the map.
no setter

Methods

addAll(Map<K, V> other) → void
This operation is not supported by an unmodifiable map.
inherited
addEntries(Iterable<MapEntry<K, V>> entries) → void
This operation is not supported by an unmodifiable 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
This operation is not supported by an unmodifiable map.
inherited
containsKey(Object? key) → bool
Whether this map contains the given key.
inherited
containsValue(Object? value) → bool
Whether this map contains the given value.
inherited
convertMapToList() → List

Available on Map, provided by the OnMapExtensions extension

deepMerge(Map<String, Object?> other) → Map<String, Object?>

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

Deep merges this map with other and returns a new map.
elementAtIntIndex(int index) → V

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

Returns the value at the given zero-based index in iteration order. Throws if the index is out of range.
filter(bool predicate(K key, V value)) → Map<K, V>

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

Filters the map, retaining only entries that satisfy the given predicate.
filterKeys(bool test(K key)) → Map<K, V>

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

Keeps only entries with keys satisfying test.
filterValues(bool test(V value)) → Map<K, V>

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

Keeps only entries with values satisfying test.
flatMap({String delimiter = '.', bool excludeArrays = false}) → Map<String, Object?>

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

Flattens a nested map into a single-level map.
forEach(void action(K key, V value)) → void
Applies action to each key/value pair of the map.
inherited
getBigInt(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, BigInt? defaultValue, ElementConverter<BigInt>? converter}) → BigInt

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

Converts the value at key (or alternativeKeys) to BigInt.
getBool(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, bool? defaultValue, ElementConverter<bool>? converter}) → bool

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

Converts the value at key (or alternativeKeys) to bool.
getBoolOrNull(Object? key) → bool?

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

getDateTime(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, String? format, String? locale, bool autoDetectFormat = false, bool useCurrentLocale = false, bool utc = false, DateTime? defaultValue, ElementConverter<DateTime>? converter}) → DateTime

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

Converts the value at key (or alternativeKeys) to DateTime.
getDouble(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, double? defaultValue, String? format, String? locale, ElementConverter<double>? converter}) → double

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

Converts the value at key (or alternativeKeys) to double.
getDoubleOrNull(Object? key) → double?

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

getEnum<T extends Enum>(K key, {required T parser(dynamic), List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, T? defaultValue, Map<String, dynamic>? debugInfo}) → T

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

Converts the value at key (or alternativeKeys) to an enum using parser.
getInt(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, int? defaultValue, String? format, String? locale, ElementConverter<int>? converter}) → int

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

Converts the value at key (or alternativeKeys) to int.
getIntOrNull(Object? key) → int?

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

getList<T>(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, List<T>? defaultValue, ElementConverter<T>? elementConverter}) → List<T>

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

Converts the value at key (or alternativeKeys) to a List of T.
getMap<K2, V2>(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, Map<K2, V2>? defaultValue, ElementConverter<K2>? keyConverter, ElementConverter<V2>? valueConverter}) → Map<K2, V2>

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

Converts the value at key (or alternativeKeys) to a Map of K2 to V2.
getNum(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, num? defaultValue, String? format, String? locale, ElementConverter<num>? converter}) → num

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

Converts the value at key (or alternativeKeys) to num.
getPath(String path, {String delimiter = '.', bool parseIndices = true}) → Object?

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

Reads a value from a nested map using path (e.g., "a.b.c").
getSet<T>(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, Set<T>? defaultValue, ElementConverter<T>? elementConverter}) → Set<T>

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

Converts the value at key (or alternativeKeys) to a Set of T.
getString(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, String? defaultValue, ElementConverter<String>? converter}) → String

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

Converts the value at key (or alternativeKeys) to String.
getString(Object? key) → String?

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

getUri(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, Uri? defaultValue, ElementConverter<Uri>? converter}) → Uri

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

Converts the value at key (or alternativeKeys) to Uri.
inj({bool autoDisposeWhenNotUsed = true}) → ReactiveModel<Map<T, D>>

Available on Map<T, D>, provided by the MapX extension

create a ReactiveModel state
intlSelect(Object choice, {String? desc, Map<String, Object>? examples, String? locale, String? name, List<Object>? args, String? meaning, bool? skip}) → String

Available on Map<Object, String>, provided by the IntlMapStringExtension extension

Format a message differently depending on choice.
intlSelectLogic(Object choice) → T

Available on Map<Object, T>, provided by the IntlMapExtension extension

Internal: Implements the logic for select - use intlSelect for normal messages.
isPrimitive() → bool

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

Returns true when every key and value is a primitive value.
joinWithMap(String separator, {String keyValueSeparator = '='}) → String

Available on Map<String, dynamic>, provided by the MapExt extension

keysWhere(bool condition(V)) → Iterable<K>

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

Returns an iterable of keys where the associated values satisfy the given condition.
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 convert function.
inherited
mapKeys<K2>(K2 transform(K key, V value)) → Map<K2, V>

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

Returns a new map with transformed keys.
mapValues<V2>(V2 transform(K key, V value)) → Map<K, V2>

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

Returns a new map with transformed values.
mapValues<V2>(V2 transform(V)) → Map<K, V2>

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

Transforms the values in this map using the given function.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
parse<T, K2, V2>(K key, T converter(Map<K2, V2> json)) → T

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

Parses the nested map at key using the provided converter.
putIfAbsent(K key, V ifAbsent()) → V
This operation is not supported by an unmodifiable map.
inherited
remove(Object? key) → V?
This operation is not supported by an unmodifiable map.
inherited
removeWhere(bool test(K key, V value)) → void
This operation is not supported by an unmodifiable map.
inherited
setIfMissing(K key, V value) → V

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

Inserts a key-value pair into the map if the key does not already exist.
setPath(String path, Object? value, {String delimiter = '.', bool parseIndices = true}) → bool

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

Writes a value into a nested map using path (e.g., "a.b.c").
swapKeysWithValues() → Map<V, K>

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

Swaps the keys with values in the map. Note: If there are duplicate values, the last key-value pair will be kept.
toJson() → String

Available on Map<String, TimeOfDay>, provided by the MapStringTimeOfDayJsonExtension extension

toJsonMap({JsonOptions options = const JsonOptions(), Object? toEncodable(dynamic object)?}) → Map<String, dynamic>

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

Converts this map to a Map<String, dynamic> with JSON-encodable values.
toJsonString({String? indent, JsonOptions options = const JsonOptions(), Object? toEncodable(dynamic object)?}) → String

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

Converts this map to a JSON string (pretty if indent is provided).
toSignal({String? debugLabel, bool autoDispose = false}) → MapSignal<K, V>

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

Convert an existing list to MapSignal
toString() → String
A string representation of this object.
inherited
tryGetBigInt(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, BigInt? defaultValue, ElementConverter<BigInt>? converter}) → BigInt?

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

Tries to convert the value at key (or alternativeKeys) to BigInt.
tryGetBool(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, bool? defaultValue, ElementConverter<bool>? converter}) → bool?

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

Tries to convert the value at key (or alternativeKeys) to bool.
tryGetDateTime(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, String? format, String? locale, bool autoDetectFormat = false, bool useCurrentLocale = false, bool utc = false, DateTime? defaultValue, ElementConverter<DateTime>? converter}) → DateTime?

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

Tries to convert the value at key (or alternativeKeys) to DateTime.
tryGetDouble(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, double? defaultValue, String? format, String? locale, ElementConverter<double>? converter}) → double?

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

Tries to convert the value at key (or alternativeKeys) to double.
tryGetEnum<T extends Enum>(K key, {required T parser(dynamic), List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, T? defaultValue, Map<String, dynamic>? debugInfo}) → T?

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

Tries to convert the value at key (or alternativeKeys) to an enum using parser.
tryGetInt(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, int? defaultValue, String? format, String? locale, ElementConverter<int>? converter}) → int?

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

Tries to convert the value at key (or alternativeKeys) to int.
tryGetList<T>(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, List<T>? defaultValue, ElementConverter<T>? elementConverter}) → List<T>?

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

Tries to convert the value at key (or alternativeKeys) to a List of T.
tryGetMap<K2, V2>(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, Map<K2, V2>? defaultValue, ElementConverter<K2>? keyConverter, ElementConverter<V2>? valueConverter}) → Map<K2, V2>?

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

Tries to convert the value at key (or alternativeKeys) to a Map of K2 to V2.
tryGetNum(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, num? defaultValue, String? format, String? locale, ElementConverter<num>? converter}) → num?

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

Tries to convert the value at key (or alternativeKeys) to num.
tryGetSet<T>(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, Set<T>? defaultValue, ElementConverter<T>? elementConverter}) → Set<T>?

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

Tries to convert the value at key (or alternativeKeys) to a Set of T.
tryGetString(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, String? defaultValue, ElementConverter<String>? converter}) → String?

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

Tries to convert the value at key (or alternativeKeys) to String.
tryGetUri(K key, {List<K>? alternativeKeys, dynamic innerKey, int? innerListIndex, Uri? defaultValue, ElementConverter<Uri>? converter}) → Uri?

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

Tries to convert the value at key (or alternativeKeys) to Uri.
tryParse<T, K2, V2>(K key, T converter(Map<K2, V2> json)) → T?

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

Tries to parse the nested map at key using the provided converter.
unflatten({String delimiter = '.', bool parseIndices = true}) → Map<String, Object?>

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

Rebuilds a nested map from a flattened map.
update(K key, V update(V value), {V ifAbsent()?}) → V
This operation is not supported by an unmodifiable map.
inherited
updateAll(V update(K key, V value)) → void
This operation is not supported by an unmodifiable map.
inherited

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
This operation is not supported by an unmodifiable map.
inherited