kudapara

class AreaCalculator {
  constructor (shapes) {
    this.shapes = shapes
  }

  sum () {
    return this.shapes
      .map((shape) => {
        if (shape instanceof Circle) {
          return 2 * Math.PI * Math.pow(shape.radius, 2)

kudapara

const circle = new Circle(7)
const square = new Square(3)
const shapes = [circle, square]

const areaCalculator = new AreaCalculator(shapes)
const areaOutput = new CalculatorOutput(areaCalculator)

// now we can access each output type
console.log(output.toString())
console.log(output.toJSON())

kudapara

class AreaCalculator {
  constructor (shapes) {
    this.shapes = shapes
  }

  sum () {
    // logic to calculate the sum of the areas of the provided shapes
  }
}

kudapara

class Circle {
   constructor (radius) {
     this.radius = radius
   }
 }

 class Square {
   constructor (length) {
     this.length = length
   }