javascript - End of an async action inside _.each -

i have asynchronous action happening inside iterator function in _.each. there way call function after callback of asynchronous action ends.

_.each(a, function (a){      b(a, function (c, d) {          // statements     } }  

i want after items in callback function inside b has been finished. i'm using in node js server.

if understood well, want execute asynchronous function each item in array, , call function when async calls have finished. achieve this, should use async module:

async.each(arr, function(item, callback){   // asynchronous function executed every item in arr   // call callback function when done    callback(); , function(){   // executed after iterator functions have finished } 

please refer async documentation more details , examples.