javascript - Promises and concurrency -

i going ask question again, because did not have right problem in mind last time.

suppose have collection of jquery selectors in array:

[{menu:'.menu-a',click:'.menu-a-click'},...] 

i want iterate through these selectors, , if menu not exist, if click exists, click...

this trouble starts. need click once, timeout before clicking again - allows menu built script, , second click hide it.

i want use promises regulate clicking. setting chain of firecrackers, lighting first one... promises execute right away. how do this?

i can code in plain old js, want learn other methods. involving all or map, suppose.

here came with. beats three-legged donkey.

var menus=[{id:0},{id:1},{id:2},{id:3}];  function doer(menu){     return new promise(function called(res,rej){       console.log('click1:'+menu.id);       settimeout(function(){         if(menu.id===2){return rej(new error('could not'));}         console.log('click2:'+menu.id);         res(1);// happy       },math.random()*8000);     });   }  promise.reduce(menus,function(ctr,cur,i){   return doer(menus[i]).then(function(res,rej){      console.log('happy:',res);   }); },$.when(1)).then(function(){   console.log('everyones done'); //no errors }).catch(function(eee){   console.log('error:',eee); }).finally(function(){   console.log('finally'); }); 

this bluebird if matters. don't know bluebird equivalent of $.when(1).