Dart simple data types

Data Types.dart

int number = 2;
num number2 = 2.0;
double number3 = 3;

String str = 'Abdulloh';

final list = [1, 2, 3];

final map = {1: 'one', 2: 'two', 3: 'three'};
final mapValue = map[1]; 

Set<int> set1 = {1, 2 ,3};

Runes runes = Runes('\u{1f605}');
  
void main() {
  print('''
Integer: $number
Number type: $number2
Double: $number3
    ''');
  
  print('''
String type: $str
     ''');
  
  print(String.fromCharCodes(runes));
  
  set1.add(2);
}