Difference between List and Map in flutter
Dart Programming - MapAdvertisements Previous Page Next Page The Map object is a simple key/value pair. Keys and values in a map may be of any type. A Map is a dynamic collection. In other words, Maps can grow and shrink at runtime. Show Maps can be declared in two ways
Declaring a Map using Map LiteralsTo declare a map using map literals, you need to enclose the key-value pairs within a pair of curly brackets "{ }". Here is its syntax var identifier = { key1:value1, key2:value2 [,..,key_n:value_n] }Declaring a Map using a Map ConstructorTo declare a Map using a Map constructor, we have two steps. First, declare the map and second, initialize the map. The syntax to declare a map is as follows var identifier = new Map()Now, use the following syntax to initialize the map map_name[key] = valueExample: Map LiteralLive Demo void main() {
var details = {'Usrname':'tom','Password':'pass@123'};
print(details);
}
It will produce the following output Example: Adding Values to Map Literals at RuntimeLive Demo void main() {
var details = {'Usrname':'tom','Password':'pass@123'};
details['Uid'] = 'U1oo1';
print(details);
}
It will produce the following output {Usrname: tom, Password: pass@123, Uid: U1oo1}Example: Map ConstructorLive Demo void main() {
var details = new Map();
details['Usrname'] = 'admin';
details['Password'] = 'admin@123';
print(details);
}
It will produce the following output {Usrname: admin, Password: admin@123}Note A map value can be any object including NULL. Map PropertiesThe Map class in the dart:core package defines the following properties
Map - FunctionsFollowing are the commonly used functions for manipulating Maps in Dart.
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