I have always wondered when to use identifiers (for example, functions) with capital first letter instead of camel case. I always write my JS in camel case like this:

function doStuff() {}



var simpleVar = 'some stuff',

    myAry = [],

    myObj = {};

... But I know I am supposed to name some things with capital first letters. I just don't know WHEN this rule applies. Hope somebody can make things a bit clearer to me.