/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 vote108 views1 answer
Flutter text direction rtl
Dart
23 votes199 views4 answers
Flutter dateFormat
Dart
0 vote117 views1 answer
Flutter CustomPaint clip
Dart
0 vote127 views1 answer
Dart compute example
Dart
0 vote126 views1 answer
Dart convert int string leading zeros
Dart
0 vote110 views1 answer
Flutter get global context
Dart
7 votes113 views3 answers
Flutter horizontal line
Dart
7 votes102 views3 answers
Flutter reverse list
Dart
2 votes104 views1 answer
Get index of element in map dart
Dart
1 vote125 views1 answer
Try using 'as prefix' for one of the import directives, or hiding the name from all but one of the imports.dartambiguous_import
Dart