Number as a variable name in javascript

01. (function(){
02. function b(e){if(!d[e]){var f=d[e]={exports:{}};c[e].call(f.exports,a,f,b)}
03. return d[e].exports
04. }
05. var a=this,c=b.modules=[],d=b.cache=[];
06. c[0]=function(a,b,c)
07. {
08. var d=this;
09. 1;
10. var e=c(1),g=c(3).Builder,h=c(11);var i=c(10);
11. var j=c(15).Circle;var k = c(17).Friend; 
12. l=c(18).SearchFriends;c(19);

This is an fb app code that i have copied fro开发者_开发知识库m fb friend circles, i am working in a different manner but was going through this script,where

FUNCTION c[0] has a variable 1 in it ...

How can bare numbers be used as variable names in javascript .. ?

That's not a variable, that's an expression.

Javascript variable names must begin with a letter or underscore or $. They may contain numbers, but not start with a number.

The statement you asked about:

1;

is a no-op. It's an expression that evaluates to a value of one, but since it isn't assigned to anything, it doesn't do anything. It doesn't declare a variable. Chances are it's a typo of some kind in the source you started with.

They are not numbers, they are function calls.
For example, if you have

function c(num){
  if(num == 10) return "Edgar";
}

when you do:

c(10)

You get "Edgar" (the function evaluation).
Hope this helps. Cheers