jQuery Deferred not working like expected -

i work jquery , deferred , there (for me) unexpected behavior. hope can explain me.

what plan is: want iterate on list of keys. every key create deferred , call function (dosomething), pass key , callback method (where resolve deferred). after call add deferred list. function dosomething async , calls @ end overgiven callback method. after iteration, await deferreds , display alerts.

the following snippet first try, isn't working correct. expected 3 alerts '0', '1' , 'first,second'. '1'.

var dosomething = function(key, callback) {      window.settimeout(function() {          callback(key);      }, 0)  }    var items = new array();  var processes = new array();  var keys = ['first', 'second'];    (var idx in keys) {      var deferred = $.deferred();        dosomething(keys[idx], function(item) {          items.push(item);          deferred.resolve();      });        processes.push(deferred.promise());  }    processes[0].done(function() {      alert('0');  })    processes[1].done(function() {      alert('1');  })    $.when.apply($, processes).done(function() {      alert(items);  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

the second try without async call in dosomething , 3 alerts.

var dosomething = function(key, callback) {      callback(key);  }    var items = new array();  var processes = new array();  var keys = ['first', 'second'];    (var idx in keys) {      var deferred = $.deferred();        dosomething(keys[idx], function(item) {          items.push(item);          deferred.resolve();      });        processes.push(deferred.promise());  }    processes[0].done(function() {      alert('0');  })    processes[1].done(function() {      alert('1');  })    $.when.apply($, processes).done(function() {      alert(items);  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

the last try async call in dosomething , work in 'seperate' function called func. gets me expected 3 alerts.

var dosomething = function(key, callback) {      window.settimeout(function() {          callback(key);      }, 0)  }    var items = new array();  var processes = new array();  var keys = ['first', 'second'];    var func = function(key) {      var deferred = $.deferred();        dosomething(key, function(item) {          items.push(item);          deferred.resolve();      });        return deferred.promise();  }    (var idx in keys) {      processes.push(func(keys[idx]));  }    processes[0].done(function() {      alert('0');  })    processes[1].done(function() {      alert('1');  })    $.when.apply($, processes).done(function() {      alert(items);  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

so question is: why first try not working expected? can't explain why.