Define global if it doesn't exist

Question

I'm trying to set a global if it doesnt exist. Total noob question.

I'm doing this:

if (!raw) {
   raw = 'yep';
}

But it keeps throwing reference error raw is not defined.

Answer 1

This is one way, assuming window exists:

if(!window.raw) {
  raw = 'yup';    
}

If not, you could just make a global object to use:

globals = {};

if(!globals.raw) {
  globals.raw = 'yup';
}

Answer 2

In the global scope add:

var raw;