Dart Multiple Constructors

Question

Is it really not possible to create multiple constructors for a class in dart?

in my Player Class, If I have this constructor

Player(String name, int col         


        

Answer 1

How about the case you want to have more than one constructor. For example, there are 2 constructors you desire to use:

Customer(String name, int age, String location) {
  this.name = name;
  this.age = age;
  this.location = location;
}

Customer(this.name, this.age) {
  this.name = name;
  this.age = age;
}

But if you define both of them in a class, there will be a compiler error.

Dart provides Named constructor that helps you implement multiple constructors with more clarity:

class Customer {
  // ...

  Customer(String name, int age, String location) {
    this.name = name;
    this.age = age;
    this.location = location;
  }

  // Named constructor - for multiple constructors
  Customer.withoutLocation(this.name, this.age) {
    this.name = name;
    this.age = age;
  }

  Customer.empty() {
    name = "";
    age = 0;
    location = "";
  }

  @override
  String toString() {
    return "Customer [name=${this.name},age=${this.age},location=${this.location}]";
  }
}

You can write it more simply with Syntactic sugar:

Customer(this.name, this.age, this.location);

Customer.withoutLocation(this.name, this.age);

Customer.empty() {
  name = "";
  age = 0;
  location = "";
}

Now we can create new Customer object by these methods.

var customer = Customer("bezkoder", 26, "US");
print(customer);
// Customer [name=bezkoder,age=26,location=US]

var customer1 = Customer.withoutLocation("zkoder", 26);
print(customer1);
// Customer [name=zkoder,age=26,location=null]

var customer2 = Customer.empty();
print(customer2);
// Customer [name=,age=0,location=]

So, is there any way to make Customer.empty() neat? And how to initialize an empty value for location field when calling Customer.withoutLocation() instead of null?

From : Multiple Constructors