This was a recent issue that I came across. I'm not sure that escaping a dollar sign with another dollar sign is a good practice, but I had no luck tracking down an elegant solution.

Iterating through and object that was inherited will return all prototypal members unless you use 'hasOwnProperty()'.

Variables need to be declared at the top of your functions. All variable declaration from within the function is done first and then function code is executed. Learn more about hoisting here: http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting and here: http://net.tutsplus.com/tutorials/javascript-ajax/quick-tip-javascript-hoisting-explained/

Always use a radix when using parseInt: parseInt('08', 10)