'use strict';

const { Transaction } = require('./9-separate.js');

// Usage

const data = { name: 'Marcus Aurelius', born: 121, city: 'Rome' };

const cities = {

'Roman Empire': ['Rome'],

};

const [obj, transaction] = Transaction.start(data, {

age() {

const currentYear = new Date().getFullYear();

const bornYear = new Date(this.born.toString()).getFullYear();

return currentYear - bornYear;

},

country() {

// implementation cann access cities index

},

});

console.dir({ age: obj.age, country: obj.country });