What is the difference between a single comma-separated variable declaration, and multiple declarations?

Question

What is the difference between comma separated declaration:

var a=0, b=0, c=0;

and multiple line declaration:

var a=0;
var b=0;         


        

Answer 1

The comma separated declaration is just a short hand. Executing-wise there's no difference. But it can help reduce the size of your javascript file if you are declaring a lot of variables.

You can even do:

var a = 1, b = 'string', c = new Date();