javascript - How do I know when the last async operation will finish? -

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i'm building app in nodejs , involves sending external requests asynchronously. had 1 id:

# client function sendajax(id) { $.ajax({   type: "post",   url: "/fsfdsfd",   data: json.stringify({"id": id}),   contenttype: "application/json; charset=utf-8",   datatype: "json", }).done(function (data) {     //.....   # server app.post("/dsfdsfd", function (req, res, nxt) {   var id = req.body.id;   anotherserverclient.sendexternalrequest(id), function(data) {     //success      //return result, when exactly?     res.end("ok");   }, function (e) {      // error, when exactly?     res.end("error");   });

now have array:

# client function sendajax(ids) { $.ajax({   type: "post",   url: "/fsfdsfd",   data: json.stringify({"ids": ids}),   contenttype: "application/json; charset=utf-8",   datatype: "json", }).done(function (data) {     //.....   # server app.post("/dsfdsfd", function (req, res, nxt) {   var ids = req.body.ids;   (var id in ids) {     anotherserverclient.sendexternalrequest(id), function(data) {       //success        //return result       res.end("ok");     }, function (e) {       // error       res.end("error");     });   } }

how can know when last operation in loop "for (var id in ids) {" finish return result client after that? what's idiomatic , simple solition?

// server app.post("/dsfdsfd", function (req, res, nxt) {   var ids = req.body.ids;   // create output array collect responses   var output = [];   (var id in ids) {     anotherserverclient.sendexternalrequest(id, function(data) {       // on success, push response output array       output.push(data);       // check if responses have come back, , handle send       // if length of our output same list of requests       if(output.length >= ids.length){         //return results array         res.end("ok");       }     }, function (e) {       // if api call fails, send error       res.end("error");     });   } });

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