'use strict';

// Task: rewrite `total` method from callbacks to async method

class Basket {

#items = null;

constructor(items) {

this.#items = items;

}

total(callback) {

let result = 0;

for (const item of this.#items) {

if (item.price < 0) {

callback(new Error('Negative price is not allowed'));

return;

}

result += item.price;

}

callback(null, result);

}

}

const electronics = [

{ name: 'Laptop', price: 1500 },

{ name: 'Keyboard', price: 100 },

{ name: 'HDMI cable', price: 10 },

];

const basket = new Basket(electronics);

basket.total((error, money) => {

if (error) console.error({ error });

else console.log({ money });

});