php - JavaScript Pass Variables Through Reference -

is there equivalent in javascript php's reference passing of variables?

[php]:

function addtoend(&$therefvar,$str) {     $therefvar.=$str; } $myvar="hello"; addtoend($myvar," world!"); print $myvar;//outputs: hello world!

how same code in javascript if possible?

thank you!

objects passed as references.

   function addtoend(obj,$str)    {       obj.setting += $str;    }     var foo = {setting:"hello"};    addtoend(foo , " world!");     console.log(foo.setting);                    // outputs: hello world! 

edit:

• as posted in comments below, cms made mention of great article.
• it should mentioned there no true way pass by reference in javascript. first line has been changed "by reference" "as reference". workaround merely close you're going (even globals act funny sometimes).
• as cms, holyvier, , matthew point out, distinction should made foo reference object , reference passed value function.

the following included way work on object's property, make function definition more robust.

   function addtoend(obj,prop,$str)    {       obj[prop] += $str;    }     var foo = {setting:"hello"};    addtoend(foo , 'setting' , " world!");     console.log(foo.setting);                    // outputs: hello world!