The type used by theWindow.localStorage andWindow.sessionStorage properties.Storage is implemented as a Map<String, String>.

To store and get values, use Dart's built-in map syntax:

window.localStorage['key1'] = 'val1';window.localStorage['key2'] = 'val2';window.localStorage['key3'] = 'val3';assert(window.localStorage['key3'] == 'val3');

You can useMap APIssuch as containsValue(), clear(), and length:

assert(window.localStorage.containsValue('does not exist') == false);window.localStorage.clear();assert(window.localStorage.length == 0);

Mixed-in types

• MapMixin<String,String>

Annotations

• @Unstable.new()
• @Native.new("Storage")

Properties

entries→Iterable<MapEntry<String,String>>

The map entries of thisMap.

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 setteroverride

isNotEmpty→bool

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

no setteroverride

keys→Iterable<String>

The keys of thisMap.

no setteroverride

length→int

The number of key/value pairs in the map.

no setteroverride

runtimeType→Type

A representation of the runtime type of the object.

no setterinherited

values→Iterable<String>

The values of thisMap.

no setteroverride

Methods

addAll(Map<String,String>other)→ void

Adds all key/value pairs ofother to this map.

override

addEntries(Iterable<MapEntry<String,String>>newEntries)→ void

Adds all key/value pairs ofnewEntries to this map.

inherited

cast<RK,RV>()→Map<RK,RV>

Provides a view of this map as havingRK keys andRV instances,if necessary.

inherited

clear()→ void

Removes all entries from the map.

override

containsKey(Object?key)→bool

Whether this map contains the givenkey.

override

containsValue(Object?value)→bool

Whether this map contains the givenvalue.

override

forEach(voidf(Stringkey,Stringvalue))→ void

Appliesaction to each key/value pair of the map.

override

map<K2,V2>(MapEntry<K2,V2>transform(Stringkey,Stringvalue))→Map<K2,V2>

Returns a new map where all entries of this map are transformed bythe givenconvert function.

inherited

noSuchMethod(Invocationinvocation)→ dynamic

Invoked when a nonexistent method or property is accessed.

inherited

putIfAbsent(Stringkey,StringifAbsent())→String

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

override

remove(Object?key)→String?

Removeskey and its associated value, if present, from the map.

override

removeWhere(booltest(Stringkey,Stringvalue))→ void

Removes all entries of this map that satisfy the giventest.

inherited

toString()→String

A string representation of this object.

inherited

update(Stringkey,Stringupdate(Stringvalue), {StringifAbsent()?})→String

Updates the value for the providedkey.

inherited

updateAll(Stringupdate(Stringkey,Stringvalue))→ void

Updates all values.

inherited

Operators

operator ==(Objectother)→bool

The equality operator.

inherited

operator [](Object?key)→String?

The value for the givenkey, ornull ifkey is not in the map.

override

operator []=(Stringkey,Stringvalue)→ void

Associates thekey with the givenvalue.

override