javascript - What happen here? (Array and pointer) -

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i typing code, when (after 3 hours searching) found (sorry, main language spanish , don't know how explain this):

i have function in file makes array add object while keeping number of elements want:

exports.addtoarraykeepingnum = function(ob, arr, count){   if (arr.length < count){     arr[arr.length] = ob;   }else{     var auxarr = new array();     var olength = arr.length;     (var = (arr.length - 1); arr.length >= count; a--){       arr.shift();     }     arr[arr.length] = ob;   } }

but now, mongoose extract document , try make this:

tools.addtoarraykeepingnum({ip: req.ip, datetime: date.now()}, doc.last_visits, 15);

and then, mongoose doesn't accept document because has been changed schema... if do:

var arr = doc.last_visits; tools.addtoarraykeepingnum({ip: req.ip, datetime: date.now()}, arr, 15); doc.last_visits = arr;

it works... why? mean... passing reference, i'm not? should works first example... think...

if can explain me, helpful!

edit:

here error printed in console:

thu, 27 nov 2014 06:38:48 gmt uncaughtexception object #<object> has no method ' save' typeerror: object #<object> has no method 'save'     @ c:\users\myname\desktop\theproject\node_modules\mongoose\lib\docum ent.js:1299:13     @ array.foreach (native)     @ model.pre.err.stack (c:\users\myname\desktop\theproject\node_modul es\mongoose\lib\document.js:1281:12)     @ model._next (c:\users\myname\desktop\theproject\node_modules\mongo ose\node_modules\hooks\hooks.js:50:30)     @ model.proto.(anonymous function) [as save] (c:\users\myname\desktop\y amireproject\node_modules\mongoose\node_modules\hooks\hooks.js:96:20)     @ promise.<anonymous> (c:\users\myname\desktop\theproject\lib\misc\l oginutils.js:76:17)     @ promise.<anonymous> (c:\users\myname\desktop\theproject\node_modul es\mongoose\node_modules\mpromise\lib\promise.js:177:8)     @ promise.emit (events.js:95:17)     @ promise.emit (c:\users\myname\desktop\theproject\node_modules\mong oose\node_modules\mpromise\lib\promise.js:84:38)     @ promise.fulfill (c:\users\myname\desktop\theproject\node_modules\m ongoose\node_modules\mpromise\lib\promise.js:97:20)

"save" it's method mongoose. can see it's lose his... identity (?)


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