code: function() {
  					var ch = exprICode(index);
  					// space or tab
  					while(ch === 32 || ch === 9 || ch === 10 || ch === 13) {
  						ch = exprICode(++index);
  					}
  				}
docs: `index` stores the character number we are currently at while `length` is a constant All of the gobbles below will modify `index` as we move along