promise1.js

'use strict';
const travel = {};

function queryForVisa() {
    console.log('Query processing ...... --------');
    let promise = new Promise(function(resolve, reject) {
        setTimeout(function() {
            let allowed = true;
            if(allowed) {
                resolve();
            } else {
                reject('The visa is denied');
            }
        }, 2000);
    });
    return promise;
}

function getVisa() {
    console.log('Visa received');
    let visa = {
        country: 'USA'
    }
    travel.visa = visa;
    return Promise.resolve(visa);
}

function bookingHotell(visa) {
    console.log(visa);
    console.log('Booking processing');
    let hotell = {
        name: 'Hilton'
    }
    travel.hotell = hotell;
    return new Promise(function(resolve, reject) {
        setTimeout(() => resolve(visa), 2000);
    });
}

function buyTickets(visa, hotell) {
    console.log(visa);
    console.log(hotell); //undefined
    console.log('Purchase of tickets');
    let ticket = {
        date: '01.01.2017'
    }
    travel.ticket = ticket;
    return Promise.resolve(ticket);
}

queryForVisa()
    .then(getVisa)
    .then(bookingHotell)
    .then(buyTickets)
    .then(function() {
        console.log('Travelling info:');
        console.log(travel);
    })
    .catch(error => console.log(error));

console.log('1');