Javascript: How to dynamicly add a number to a variable name?

Question

Say I have to following code:

var numb = $(selector).length;

And now I want to dynamicly make variables based on this:

var temp+numb = ...

How would I be able to do this?

Edit:

I know some of you will tell me to use an array. Normally I would agree but in my case the var is already an array and I rly see no other solution than creating dynamic names.

here it is:: http://stackoverflow.com/questions/5117127/javascript-dynamic-variable-name — Sudhir Bastakoti, Sep 15 '13 at 06:51

score 5 · Accepted Answer · answered Sep 15 '13 at 06:48

5

Variables in Javascript are bound to objects. Objects accept both . and [] notation. So you could do:

var num = 3;    
window["foo"+num] = "foobar";    
console.log(foo3);

PS - Just because you can do that doesn't mean you should, though.

answered Sep 15 '13 at 06:48

Ayush

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Only works in a browser window, not server-side, and really messy. – deitch Sep 15 '13 at 06:53
@deitch - hence my suggestion of a scope of his own – mplungjan Sep 15 '13 at 06:53
@deitch: Hence the disclaimer at the end of the question. It's hard to offer a better solution (and I'm sure there is one) unless OP shares more context. – Ayush Sep 15 '13 at 06:54
I just need it client side. It's for a socketserver chatsystem and I want to use this to dynamicly open tabs for private chats. This is what I needed to get it done. Thanks! – icecub Sep 15 '13 at 07:00

mplungjan · Answer 2 · 2013-09-15T06:54:19.677

3

In global scope (not recommended):

window["temp"+numb]='somevalue;
window.console && console.log(temp3);

In a scope you create - also works serverside where there is no window scope

var myScope={};
myScope["temp"+numb]="someValue";
window.console && console.log(myScope.temp3);

edited Sep 15 '13 at 06:54

answered Sep 15 '13 at 06:48

mplungjan

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Javascript: How to dynamicly add a number to a variable name?

2 Answers2