/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

1 vote329 views1 answer
Get direction routes in mapbox flutter
Dart
7 votes345 views2 answers
Flutter snackbar margin
Dart
3 votes318 views1 answer
Flutter listtile leading and title space
Dart
2 votes336 views2 answers
Dart list equality
Dart
4 votes334 views1 answer
How to Create Number Inputfield in Flutter?
Dart
9 votes374 views2 answers
Dart regex for email
Dart
1 vote324 views1 answer
Splite number in dart
Dart
7 votes299 views1 answer
Dart card outline
Dart
8 votes351 views2 answers
Dart katta harfga o'zgartirish
Dart
3 votes315 views1 answer
How to create a small circular dot in FLutter code example
Dart