javascript - How to process users in one specific order using map o each function? -

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i create cloud function process items in specific order , make network request api each item , update them result of api.

i tried this. order not respected , computation of "remainingcredits" wrong. note function "getuserpageview()" make api call , return promise result.

  query.descending("createdat");   return query.find().then(function(items) {         var remainingcredits=0;         var promises= _.map(items, function(item){             var credit=item.get("credit_buy");             return getuserpageview(123, new date()).then(function(pageviews){                 var usedcredit=credit-pageviews;                 if(remainingcredits>0)                     return remainingcredits+credit;                 if(credit-usedcredit<=0){                     console.log("usedcredit:"+usedcredit);                     item.set("used",true);                     return 0;                 }else{                     remainingcredits+=usedcredit;                     return remainingcredits;                 }             });         });         return parse.promise.when(promises);     }).then(function(results){         console.log(_.toarray(arguments));         status.success();     }, function(error){         status.error(error);     });

how can calculate remainingcredits specific order?

if important process asynchronously derived data in original items order, should not processed arrives.

try waiting data arrive, process it.

query.descending("createdat"); return query.find().then(function(items) {     return parse.promise.when(_.map(items, function(item) {         return getuserpageview(123, new date()).then(function(pageviews) {             //here, create object data required later processing             return {                 item: item,                 pageviews: pageviews             };         });     })); }).then(function() {     var remainingcredits = 0;     var runningbalance _.toarray(arguments).map(function(obj) {         var credit = obj.item.get("credit_buy");         var usedcredit = credit - obj.pageviews;         if(remainingcredits > 0)             return remainingcredits + credit;         if((credit - usedcredit) <= 0) {             console.log("usedcredit:" + usedcredit);             obj.item.set("used", true);             return 0;         } else {             remainingcredits += usedcredit;             return remainingcredits;         }     });     console.log(runningbalance);     status.success();     return runningbalance; }, function(error) {     status.error(error); });

i invented variable name runningbalance because appear trying create.

i tried verify processing of credits , can suggest needs looking @ again. example, if usedcredit = credit - obj.pageviews, test if((credit - usedcredit) <= 0) {...} simplify if(obj.pageviews <= 0) {...}, doesn't seem right.


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