JsBackedMap class

A view into a JavaScript object (jsObject) that conforms to the Dart Map interface.

The keys are all enumerable properties of the jsObject, though non-enumerable properties may also be accessed. For this reason, it is recommended to use plain, simple JavaScript objects.

Keys should be strings, as any other object (primitive or non-primitive), will be coerced by JavaScript to a string upon read/write. This includes null, which gets coerced to the string 'null'.

For performance reasons, keys are not validated.

Iteration order is arbitrary, and is based on the current browser's implementation.

Two JsBackedMap instances are considered equal if they are backed by the same jsObject.

Inheritance

• Object
• MapBase
• JsBackedMap

Constructors

JsBackedMap()

Creates a JsBackedMap instance backed by a new jsObject.

JsBackedMap.backedBy(JsMap jsObject)

Creates a JsBackedMap instance backed by jsObject.

JsBackedMap.from(Map other)

Creates a JsBackedMap instance that contains all key/value pairs of other.

factory

JsBackedMap.fromJs(JsMap jsOther)

Creates a JsBackedMap instance that contains all key/value pairs of the JS object jsOther.

factory

Properties

entries → Iterable<MapEntry>

The map entries of this.

no setter, inherited

hashCode → int

The hash code for this object.

no setter, override

isEmpty → bool

Whether there is no key/value pair in the map.

no setter, inherited

isNotEmpty → bool

Whether there is at least one key/value pair in the map.

no setter, inherited

jsObject → JsMap

final

keys → Iterable

The keys of this.

no setter, override

length → int

The number of key/value pairs in the map.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

values → Iterable

The values of this.

no setter, override

Methods

addAll(Map other) → void

Adds all key/value pairs of other to this map.

override

addAllFromJs(JsMap jsOther) → void

Adds all key/value pairs of the JS object jsOther to this map.

addEntries(Iterable<MapEntry> 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 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

forEach(void action(dynamic key, dynamic value)) → void

Applies action to each key/value pair of the map.

inherited

map<K2, V2>(MapEntry<K2, V2> transform(dynamic key, dynamic value)) → Map<K2, V2>

Returns a new map where all entries of this map are transformed by the given convert function.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

putIfAbsent(dynamic key, dynamic ifAbsent()) → dynamic

Look up the value of key, or add a new entry if it isn't there.

inherited

remove(Object? key) → dynamic

Removes key and its associated value, if present, from the map.

override

removeWhere(bool test(dynamic key, dynamic value)) → void

Removes all entries of this map that satisfy the given test.

inherited

toString() → String

A string representation of this object.

inherited

update(dynamic key, dynamic update(dynamic value), {dynamic ifAbsent()?}) → dynamic

Updates the value for the provided key.

inherited

updateAll(dynamic update(dynamic key, dynamic value)) → void

Updates all values.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

override

operator [](Object? key) → dynamic

The value for the given key, or null if key is not in the map.

override

operator []=(dynamic key, dynamic value) → void

Associates the key with the given value.

override