Methods and functions in JavaScript

Question

Please can someone help me with this code
Need fix the method in calculating the discount

function main() {
var prodID = readLine();
var price = parseInt(readLine(), 10);
var discount = parseInt(readLine(), 10);

var prod1 = new Product(prodID, price);
console.log(prod1.prodID + " price: " + prod1.price);

prod1.changePrice(discount);
console.log(prod1.prodID + " new price: " + prod1.price);
}

function Product(prodID, price) {
this.prodID = prodID;
this.price = price;

this.changePrice = function(discount) {
// The answer to this code goes here
};

Answer 1

This.price = this.price -(this.price * discount)

This is known as a mutator, as it changes the underlying code, a more sustainable way to keep the original prices would be this

Return this.price -(this.price * discount)

Then there would be no underlying data manipulation, then if you wanted to you could create a set price method.

also, this is hypothetical, I don't remember all the JavaScript syntax, so you will have to appropriately apply what I said to JavaScript rules