Programming in Dart: Classes

Jun 28 2022 · Dart 2.17, Flutter 3.0, DartPad

Part 1: Understand Classes

06. Utilize Initialization Lists

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Previous episode: 05. Challenge: Define a Constructor Next episode: 07. Define Multiple Constructors

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When we define a constructor in Dart, we define the initialization followed by any code that we want to want run.

class User {
  final int id;
  final String name;
  
  User(this.id, this.name); 
}

final String uniqueId;

User(this.id, this.name) : uniqueId = '$id$name';

User(this.id, this.name) : uniqueId = id.toString() + name;

print(100.toString());

print(43.isEven)

var user = User(42, 'Ray');

print(user.uniqueId);

User(this.id, this.name) : uniqueId = id.toString() + name {
  print(uniqueId);
}