callback_hell.js

fetchSomeStuff(
    /* onSuccess*/ function (a) {
        fetchSomeStuffDependingOnA(
            a,
            /* onSuccess */ function (b) {
                fetchSomeStuffDependingOnB(
                    b,
                    /* onSuccess */ function (c) {
                        /* Code goes on here */
                    },
                    /* onFailure */ function (ex) {
                        handleException(ex);
                    }
                )
            },
            /* onFailure */ function (ex) {
                handleException(ex);
            }
        );
    },
    /* onFailure */ function (ex) {
    handleException(ex);
    }
);