PromiseTutorial2 created by kenanhancer - https://repl.it/@kenanhancer/PromiseTutorial2

PromiseTutorial2.js

const delay = duration => new Promise(resolve => setTimeout(resolve, duration));

const uniqueId = () =>
	Math.random().toString(36).substring(2) + new Date().getTime().toString(36);

class Person {
	constructor(firstName, lastName) {
		this.PersonId = uniqueId();
		this.firstName = firstName;
		this.lastName = lastName;
		this.created = Date.now();
		this.updated = this.created;
		this.isDeleted = false;
	}

	getFullName() {
		return this.firstName + ' ' + this.lastName;
	}
}

const getPersonsAsync = async () => {
	await delay(1000);

	return [
		new Person('Kenan', 'Hancer'),
		new Person('Enes', 'Cakir'),
		new Person('Hakan', 'Duman'),
		new Person('Hasan', 'Oz'),
		new Person('Kerim', 'Tekin'),
		new Person('Nida', 'Demir'),
		new Person('Firat', 'Kamis'),
	];
};

const getPersons = callback => {
	getPersonsAsync()
		.then(persons => {
			if (callback.length == 1) {
				callback(persons);
			} else {
				callback(null, persons);
			}
		})
		.catch(ex => {
			if (callback.length == 1) {
				return callback(ex);
			} else {
				return callback(ex, null);
			}
		});
};

getPersons((err, result) => {
	for (let i = 0; i < result.length; i++) {
		console.log(result[i]);
	}
});