'use strict';

const i = 5;

const f = 10.3;

const s = 'Hello';

const b = true;

const o = {

name: 'Marcus Aurelius',

born: 121,

city: 'Roma',

position: 'emperor'

};

o.city = 'Odessa';

const a = ['Athens', 'Roma', 'London', 'Beijing', 'Kiev', 'Riga'];

a.push('Odessa');

a.unshift('New York');

console.log('shifted:' + a.shift());

console.log('pop: ' + a.pop());

console.log({ i }, typeof(i));

console.log({ s }, typeof(s));

console.log({ b }, typeof(b));

console.log({ f }, typeof(f));

console.log({ o }, typeof(o), { isArray: Array.isArray(o) });

console.log({ a }, typeof(a), { isArray: Array.isArray(a) });

console.log({ a }, { instanceofArray: a instanceof Array });