gistfile1.txt

// my class
function Parser() {
		// I'd like this to remain a private variable
		this.data = {
			number:0
		};
}

// my class function
Parser.prototype.test = function() {

	// I'd like this function to accept a number and increment the number;
	var inc = function(data) {
		data.num++;
	};

	// this will be 0
	console.log(this.data);
	// increment the variable
	inc(this.data.number);
	// I want this to now show the variable as incremented
	console.log(this.data);

};

// instance the class
var parse = new Parser();
// run the class function
parse.test();