RenderLargeNumber.js

(function main() {
    getLargeNumber()
        .then(function (number) {
            console.log('We got ' + number);
        });
})();

function getLargeNumber() {
    return new Promise(function (resolve, reject) {
        setTimeout(() => {
            var value = Math.floor(Math.random() * 20000);
            resolve(value);
        }, 2000);
    });
}