// Learning JavaScript
// chapter 14 : Asynchronous Programming

// use Promise

function countdown(seconds) {
    return new Promise(function(resolve, reject) {
        for (let i = seconds; i >= 0; i--) {
            setTimeout(function() {
                if (i > 0) console.log(i + '...');
                else resolve(console.log('GO!'));
            }, (seconds - i) * 1000);
        }
    });
}

countdown(5).then(
    function() {
        console.log('countdown completed successfully');
    },
    function(err) {
        console.log('countdown experienced an error ' + err.message);
    }
);

const p = countdown(5);
p.then(function() {
    console.log('countdown completed successfully');
});
p.catch(function(err) {
    console.log('countdown experienced ann error: ' + err.message);
});