named constructor dart

1class MyClass {
2  int param1;
3  MyClass(this.param1);
4}
5final obj = MyClass(100);
6
7class MyClassNamed {			// with named parameters
8  int param1;
9  MyClassNamed({required this.param1});
10}
11final objNamedParam = MyClassNamed(param1: 100);

1class Person {
2  String name;
3  int age;
4  Person({this.name = '', this.age = 0});
5}
6
7void main() {
8  Person person1 = Person(name: "Raaj", age: 35);
9  print(person1.age);
10}

1class Customer {
2  String name;
3  int age;
4  String location;
5
6  // constructor
7  Customer(String name, int age, String location) {
8    this.name = name;
9    this.age = age;
10    this.location = location;
11  }
12}
13

1class Chipmunk {
2  String name;
3  int fame;
4
5  Chipmunk.named(this.name, [this.fame]);
6
7  Chipmunk.famous1() : this.named('Chip', 1000);
8  factory Chipmunk.famous2() {
9    var result = new Chipmunk.named('Chip');
10    result.fame = 1000;
11    return result;
12  }
13}
14

1void main() {
2  Human jenny = Human(height1 :15);
3    print(jenny.height);
4  
5  Human jerry = Human(height1: 20);
6    print(jerry.height);
7}
8
9class Human {
10  double height = 0;
11  
12  Human({height1 = 0}) { // constructor = initializes values of properties in the class.
13    this.height = height1;
14  }
15  
16}
17

1Customer(String name, int age, String location) {
2  this.name = name;
3  this.age = age;
4  this.location = location;
5}
6
7Customer(this.name, this.age) {
8  this.name = name;
9  this.age = age;
10}
11