Static Keyword in Dart

void main() {
  double a = 5;
  double b = 10;
  print("area: ${RectangleHelper.area(a, b)}");
  print("perimeter: ${RectangleHelper.perimeter(a, b)}");
}

class RectangleHelper {
  static double area(double a, double b) {
    return a * b;
  }

  static double perimeter(double a, double b) {
    return (a + b) * 2;
  }
}
  

Output

area: 50.0
perimeter: 30.0