DART: Playing with class, initialization list.

playwithclass_Dartpad.dart

import 'dart:math' as math;

const double originX=5;
const double originY=5;


class Point {
   double x;
   double y;

  Point(this.x, this.y);
  
  Point.zero(): x=0, y=0;
  
  Point.origin(): x=originX, y=originY;
  

  double distanceSquared(Point other) {
    var dx = x - other.x;
    var dy = y - other.y;
    return math.sqrt(dx * dx + dy * dy);
  }
}

main() {
  print("hello");
  Point myPoint=Point(10,5);
  print('x is' + myPoint.x.toString());
  print('should be zero  and is ' + myPoint.distanceSquared(Point(10,5)).toString() );
  print('should be 25  and is ' + myPoint.distanceSquared(Point.origin()).toString() );
  print('should be 125  and is ' + myPoint.distanceSquared(Point.zero()).toString() );
  print('should be unknown  and is ' + myPoint.distanceSquared(Point(10,6)).toString() );
}