import 'dart:math';
class Position {
final int x;
final int y;
final double rad;
// An initializer list allows
// fields to be defined before the constructor body.
// This is required for final fields.
Position(int x, int y)
: this.x = x,
this.y = y,
rad = atan2(y, x);
}
main() {
var p = new Position(2, 3);
print('x: ${p.x} y: ${p.y}');
print('rad: ${p.rad}');
}
$ initializer_lists.dart
x: 2 y: 3
rad: 0.5880026035475675