description

# UnmodifiableMapView<K, V> class Null safety

View of a Map that disallow modifying the map.

A wrapper around a `Map` that forwards all members to the map provided in the constructor, except for operations that modify the map. Modifying operations throw instead.

Inheritance
  - Object
  - MapView<K, V>
  - UnmodifiableMapView

## Constructors

UnmodifiableMapView(Map<K, V> map)

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

## 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. [...]
  override
clear() → void
  This operation is not supported by an unmodifiable map.
  inherited
containsKey(Object? key) → bool
  Returns true if this map contains the given `key`. [...]
  inherited
containsValue(Object? value) → bool
  Returns true if this map contains the given `value`. [...]
  inherited
forEach(void action(K key, V value)) → void
  Applies `f` to each key/value pair of the map. [...]
  inherited
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
  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
toString() → String
  Returns a string representation of this object.
  inherited
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?
  Returns the value for the given `key` or null if `key` is not in the map. [...]
  inherited
operator []=(K key, V value) → void
  This operation is not supported by an unmodifiable map.
  inherited