Product Class
Create new Javascript file named product.js. This file contains code demo as below:
class Product {
constructor(id, name, price, quantity) {
this.id = id;
this.name = name;
this.price = price;
this.quantity = quantity;
}
toString() {
return 'Id: ' + this.id + '\nName: ' + this.name + '\nPrice: ' + this.price + '\nQuantity: ' + this.quantity;
}
total() {
return this.price * this.quantity;
}
}
module.exports = Product;
Create Index
Create new Javascript file named index.js. This file contains code demo as below:
let Product = require('./product');
let product1 = new Product("p01", "name 1", 4, 2);
let product2 = new Product("p02", "name 2", 11, 3);
let product3 = new Product("p03", "name 3", 7, 8);
let products = [product1, product2, product3];
let result1 = products.reduce((a, b) => +a + +b.quantity, 0);
console.log('Result 1: ' + result1);
let result2 = products.reduce((a, b) => +a + +b.quantity * +b.price, 0);
console.log('Result 2: ' + result2);
Output
Use node index.js statement run code demo
Result 1: 13
Result 2: 97