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 color) {     this._color = color;     this._name = name; } 

Then I try to add this constructor:

Player(Player another) {     this._color = another.getColor();     this._name = another.getName(); } 

I get the following error:

The default constructor is already defined.

I'm not looking for a workaround by creating one Constructor with a bunch of non required arguments.

Is there a nice way to solve this?

Answer 1

You can only have one unnamed constructor, but you can have any number of additional named constructors

class Player {   Player(String name, int color) {     this._color = color;     this._name = name;   }    Player.fromPlayer(Player another) {     this._color = another.getColor();     this._name = another.getName();   }   }  new Player.fromPlayer(playerOne); 

This constructor can be simplified

  Player(String name, int color) {     this._color = color;     this._name = name;   } 

to

  Player(this._name, this._color); 

Named constructors can also be private by starting the name with _

class Player {   Player._(this._name, this._color);    Player._foo(); } 

Constructors with final fields initializer list are necessary:

class Player {   final String name;   final String color;    Player(this.name, this.color);    Player.fromPlayer(Player another) :     color = another.color,     name = another.name; } 

Answer 2

If your class uses final parameters the accepted answer will not work. This does:

class Player {   final String name;   final String color;    Player(this.name, this.color);    Player.fromPlayer(Player another) :     color = another.color,     name = another.name; }