kudapara

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

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

kudapara

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

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

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

kudapara

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

    area () {
      return 2 * Math.PI * Math.pow(shape.radius, 2)
    }
  }

kudapara

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

  area () {
    return 2 * Math.PI * Math.pow(shape.radius, 2)
  }
}

kudapara

class Shape {
  constructor () {}
  area () {}
  volume () {}
}

class Triangle extends Shape {
  constructor (base, height) {
    this.base = base
    this.height = height

kudapara

class Shape {
  constructor () {}
  area () {}
}

class SolidShape {
  constructor () {}
  volume () {}
}

kudapara

class Shape {
  constructor () {}
  setColor(color) {
    this.color = color
  }
}

class Picture {
  constructor (color) {
    this.shape = new Shape()

kudapara

class Shape {
  constructor () {}
  setColor (color) {
    this.color = color
  }
}

class Triangle extends Shape {
  constructor (base, height) {