/Dart/Dart set final variable in constructor

Dart set final variable in constructor

// You cannot mutate final variables in a constructor body, 
// instead you must use a special syntax.
// Also note if you have a super() call, it must be called last.
class Point {
  final num x;
  final num y;
  final num distanceFromOrigin;

  // Special syntax
  Point(this.x, this.y) :
    distanceFromOrigin = sqrt(pow(x, 2) + pow(y, 2));
}

Source: stackoverflow.com

Similar codes

0 vote182 views1 answer
Flutter toggle color card on tap
Dart
14 votes153 views5 answers
Flutter get current date
Dart
3 votes151 views2 answers
Flutter appbar text color
Dart
0 vote174 views1 answer
What is the problem to aqueduct with dart 2.8
Dart
0 vote166 views1 answer
Flutter concat string list
Dart
3 votes170 views3 answers
Flutter dictionary example
Dart
3 votes172 views1 answer
Android studio emulator blue screen windows 10
Dart
0 vote166 views1 answer
Navigator.pushandremoveuntil flutter
Dart
13 votes172 views1 answer
Flutter column vertical direction
Dart
0 vote167 views1 answer
Toolbar image dart
Dart