javascript function

Javascript declaration vs expression

//Function Declaration
function add(a,b) {return a + b};
//Function Expression
var add = function(a,b) {return a + b};

http://javascriptweblog.wordpress.com/2010/07/06/function-declarations-vs-function-expressions/
http://stackoverflow.com/questions/16439949/define-local-function-in-javascript-use-var-or-not

So use expression when possible