function getPersons() {

    let personsArr = [];

    // Gabriel Peterson 24 g.p@gmail.com


    let persons = [

        ['Anna', 'Simpson', 22, 'anna@yahoo.com'],

        ['SoftUni'],

        ['Stephan', 'Johnson', 25],

        ['Gabriel', 'Peterson', 24, 'g.p@gmail.com'],

        ['Erol', 'Mehmed']

    ];

    class Person {

        constructor(firstName, lastName, age, email) {

            this.firstName = firstName;

            this.lastName = lastName;

            this.age = age;

            this.email = email;

        };

        toString() {

            let person = `${this.firstName} ${this.lastName} (age: ${this.age}, email: ${this.email})`;

            return person;

        };


        toString2() {

            let person = `${this.firstName} ${this.lastName} (age: ${this.age})`;

            return person;

        };


        toString3() {

            let person = `${this.firstName} ${this.lastName}`;

            return person;

        };


        toString4() {

            let person = this.firstName;

            return person;

        };


    };


    for (let arr of persons) {

        let firstName = arr[0];

        let lastName = arr[1];

        let age = arr[2];

        let email = arr[3];


        if (arr.length === 4) {

            let person = new Person(firstName, lastName, age, email);

            personsArr.push(person.toString());

        } else if (arr.length === 3) {

            let person = new Person(firstName, lastName, age);

            personsArr.push(person.toString2());

        } else if (arr.length === 2) {

            let person = new Person(firstName, lastName);

            personsArr.push(person.toString3());

        } else if (arr.length === 1) {

            let person = new Person(firstName);

            personsArr.push(person.toString4());

        }

    }

    // console.log(personsArr);

    return personsArr;

}