zlatkov

listen('click', function (e){
    setTimeout(function(){
        ajax('https://api.example.com/endpoint', function (text){
            if (text == "hello") {
	        doSomething();
	    }
	    else if (text == "world") {
	        doSomethingElse();
            }
        });

zlatkov

listen('click', function (e) {
	// ..
});

zlatkov

setTimeout(function(){
    // ..
}, 500);

zlatkov

ajax('https://api.example.com/endpoint', function (text){
    // ..
});

zlatkov

if (text == "hello") {
    doSomething();
}
else if (text == "world") {
    doSomethingElse();
}

zlatkov

var x = 1;
var y = 2;
console.log(x + y);

zlatkov

function sum(getX, getY, callback) {
    var x, y;
    getX(function(result) {
        x = result;
        if (y !== undefined) {
            callback(x + y);
        }
    });
    getY(function(result) {
        y = result;

zlatkov

function sum(xPromise, yPromise) {
	// `Promise.all([ .. ])` takes an array of promises,
	// and returns a new promise that waits on them
	// all to finish
	return Promise.all([xPromise, yPromise])

	// when that promise is resolved, let's take the
	// received `X` and `Y` values and add them together.
	.then(function(values){
		// `values` is an array of the messages from the

zlatkov

sum(fetchX(), fetchY())
.then(
    // fullfillment handler
    function(sum) {
        console.log( sum );
    },
    // rejection handler
    function(err) {
    	console.error( err ); // bummer!
    }

zlatkov

function delay(time) {
    return new Promise(function(resolve, reject){
        setTimeout(resolve, time);
    });
}

delay(1000)
.then(function(){
    console.log("after 1000ms");
    return delay(2000);