Constructors

class Point {
  final double x;
  final double y;

  Point(this.x, this.y);

  Point.origin()
      : x = 0,
        y = 0;

  Point.vertical(double yValue)
      : x = 0,
        y = yValue;
}

void main() {
  final p1 = Point(2, 3);
  final p2 = Point.origin();
  final p3 = Point.vertical(10);

  print('p1: ${p1.x}, ${p1.y}');
  print('p2: ${p2.x}, ${p2.y}');
  print('p3: ${p3.x}, ${p3.y}');
}