/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

2 votes319 views1 answer
Flutter take 90 percent of screen height
Dart
0 vote298 views1 answer
Rectangualr fab in flutter
Dart
5 votes295 views1 answer
String to double fultter
Dart
0 vote309 views1 answer
At this point the state of the widget element tree is no longer stable. flutter
Dart
16 votes286 views4 answers
How to give width based on screen size flutter
Dart
0 vote352 views1 answer
Dart count words in string
Dart
0 vote319 views1 answer
AnimatedCrossFade
Dart
2 votes306 views2 answers
Flluter toast
Dart
0 vote327 views1 answer
Find and update element in list dart
Dart
9 votes318 views1 answer
Dart ternary operator multiple
Dart