continuables-then.js

var continuables = require('continuables'), sys = require('sys');

function delay(timeout, fail) {
    var continuable = continuables.create();
    setTimeout(function () {
        if (fail)
            continuable.fulfill(new Error('fail'));
        else
            continuable.fulfill(true);
    }, timeout);
    return continuable;
}

var c = delay(1000)
.then(function () {
    sys.puts('first callback');
    return delay(1000, true);
})
.then(function () {
    sys.puts('second callback');
    return delay(1000);
})
.then(function () {
    sys.puts('third callback');
}, function (e) {
    sys.puts('this is the common error handler');
});