Question

Use Javascript to implement the class below to the code below.

• Create a class Order which contains one array member variable that stores Sandwich objects. Initially, this array is empty.
  • Add a function named add that adds a sandwich to the array.
  • Add a getter function named price which iterates over the array and sums up the price of each  sandwich in the array.

class Sandwich {

constructor(price) {

this.price = price;

}

toString() {

return "Sandwich", this.price;

}

}

class Burger extends Sandwich {

constructor(price, lettuce, meat) {

super(price)

this.lettuce = lettuce;

this.meat = meat;

}

toString() {

return "Burger", this.price;

}

}

class CheeseBurger extends Burger {

constructor(price, lettuce, meat, cheese) {

super(price, lettuce, meat)

this.cheese = cheese;

}

toString() {

return "CheeseBurger", this.price;

}

}

Answer 1

class Sandwich {

/*Sandwich class already implemented and given*/

constructor(price) {

this.price = price;

}

toString() {

return "Sandwich", this.price;

}

}

class Burger extends Sandwich {

/*Burger class extending sandwich class already implemented and given*/

constructor(price, lettuce, meat) {

super(price)

this.lettuce = lettuce;

this.meat = meat;

}

toString() {

return "Burger", this.price;

}

}

class CheeseBurger extends Burger {

/*ChesseBurger class extending burger class already implemented and given*/

constructor(price, lettuce, meat, cheese) {

super(price, lettuce, meat)

this.cheese = cheese;

}

toString() {

return "CheeseBurger", this.price;

}

}

class Order{

/* New Order Class which will manage new orders*/

constructor() {

this.orderArray = []; /* Initializing empty array*/

/* For storing new sandwich objects*/

}

add(price){ /* add method which takes price of sandwich as argument*/

var sandwich = new Sandwich(price); /*new sandwich object*/

this.orderArray.push(sandwich); /*Adding objects to orderArray*/

return;

}

price() {/*This function will return the sum of price of all sandwiches*/

let sum = 0;

for(let i=0;i<this.orderArray.length;i++){

sum += this.orderArray[i].price; /*Taking sum*/

}

return sum;

}

}

/*Demo object created to show the working of new 'Order' class*/

newOrder = new Order();

newOrder.add(10);

newOrder.add(20);

newOrder.add(30);

newOrder.add(40);

console.log(newOrder.price()); /*Getting the final sum in console*/