Method / variable call chaining in dart.

CascadeOperator.dart

//Cascade/Chaining/Fluent Operations
//We can chain method/member calls without returning `this` from method/getter/setter

class User {
  String name;
  int age;

  User({this.name = "Foo", this.age = 0});

  User withName(String name) {
    this.name = name;
    return this;
  }

  User withAge(int age) {
    this.age = age;
    return this;
  }

  void printId() => print("$name is $age years old.");
}

void main() {
  withoutCascadeOperator();
  withCascadeOperator();
 }

withoutCascadeOperator() {
  print("Without Cascade Operator".toUpperCase());
  User user = User();
  user.printId();
  user
    .withAge(27)
    .withName("Laxman");
  user.printId();
}

withCascadeOperator() {
  print("\n-----------------------------------------\n"+
  "With Cascade Operator".toUpperCase());
  
  User user = User()
    ..age=27
    ..name="Laxman"
    ..printId(); 
 
  user
    ..age= 30
    ..name="Ram";
  user.printId();

}