javascript - Chaining more than two tasks using deferred and can this be use for loops? -

i getting used $.deferred now, , happens needed chain 3 tasks using $.deferred - then. created function:

function processa(param1, param2) {     log = $.post('http://domain.com/process',                 {                    id: param1,                    another: param2                 }            ),            set = log.then(function(html){                 if (somecondition) {                     console.log('successful');                     // want ajax call here                     // , chain another, ajax again                 }            }) } 

how do that, stated in comments of code. right? not tested, thought while typing this.

set = log.then(function(html){       if (somecondition) {           console.log('successful');           $.post(....),           def = set.then(function(data){              // want thing here.           })        } }) 

and thing, possible use function in loop? e.g.

data = [{param1:"...", param2:"..."}, {..., ...}] $.each(data, function(k,v){     processa(v.param1, v.param2); }) 

here better explained chaining promises:

function authenticate() {     return getusername()     .then(function (username) {         return getuser(username);     })     // chained because not need user name in next event     .then(function (user) {         return getpassword()         // nested because need both user , password next         .then(function (password) {             if (user.passwordhash !== hash(password)) {                 throw new error("can't authenticate");             }         });     }); }