javascript - async.timesLimit() will not accept a valid callback function -

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problem

i working api using async library node. i've hit obstacle can't seem around.

i modifying object in database through restful api. command i'm using called modifyobject , works. making function allows me edit multiple objects @ once asynchronously. but, don't want hit server 100 requests @ once, i'm using async.timeslimit(). can find the documentation function here. here shared.js utility function file:

var async = require('async');  exports.modifyobject = function (objectid, data, callback) {     setup.api()         .json()         .patch('/object(' + objectid + ')')         .header("x-apikey", setup.apikey())         .send(data)         .end(function (err, res, body) {           if(err) throw err;           callback(res);     }); };  exports.modifymultipleobjects = function (arrayofobjectids, data, callback) {     var failedarray = [];     async.timeslimit(arrayofobjectids.length, 3, function (n, next) {         exports.modifyobject(arrayofobjectids[n], data, function (response) {             if(response.statuscode != 204) failedarray.push("failed modify object: " + arrayofobjectids[n]);             next(null);         });     }, function (err, failedarray) {         if(err) throw err;         callback(failedarray);     }); };

data json object.

so, create multiple objects, call modifymultipleobjects on array of ids, typeerror: undefined not function thrown @ me. here how i'm calling in mocha test:

var shared = require('../shared.js');  describe('test', function () {     it('modify multiple objects', function (done) {         var moddata = {             "propa": 100,             "propb": 200         };         shared.modifymultipleobjects(objarray, moddata, function (errarr) {             if(errarr.length > 0) throw new error(errarr);             done();         });     }); });

the objarray valid. have checked multiple times.

error stacktrace

uncaught typeerror: cannot read property undefined not function @ object.exports.modifymultipleobjects(c:blahblahblah\shared.js:1374:8) @ context.<anonymous> (c:\blahblahblah\general\modify_multiple_ojbects.js:46:10)

the line modify_multiple_objects.js is:

shared.modifymultipleobjects(objarray, moddata, function (errarr) {

the line shared.js is:

async.timeslimit(arrayofobjectids.length, 3, function (n, next) {

i rewrote both functions using async.timeslimit() , async.eachlimit() (as suggested @bergi).

eachlimit():

    async.eachlimit(objectids, 5, function (item, next) {         exports.modifyobject(item, data, function (res) {             if (res.statuscode != 204) throw new error("failed modify object " + item);             next();         }, function (err) {             callback();         });     });

timeslimit():

    async.timeslimit(objectids.length, 5, function (n, next) {         exports.modifyobject(objectids[n], data, function (res) {             if(res.statuscode != 204) throw new error("failed modify object " + objectids[n]);             next();         });     }, function (err) {         callback();     });

the timeslimit() function throws same uncaught typeerror: undefined not function error stated in question.

however, eachlimit() works perfectly. don't understand why though. far can tell, timeslimit() written correctly, , these 2 functions should identical.


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