promises-1.js

var delay = function (timeout) {
    var deferred = new Deferred();
    setTimeout(function () {
        deferred.resolve();
    }, timeout);
    return deferred.promise;
};

delay(1000).then(function () {
    // time flies
});

// and, equivalently
when(delay(1000), function () {
    // time flies
});

// which is important for immediately
// resolvable values, the domain of 
// all values and promises
when(10, function (n) {
    // didn't have to wait a tick
});