dasdany

// Array literal (= []) is faster than Array constructor (new Array())
// http://jsperf.com/new-array-vs-literal/15
var array = [];

// Object literal (={}) is faster than Object constructor (new Object())
// http://jsperf.com/new-array-vs-literal/26
var obj = {};

// property === undefined is faster than hasOwnProperty(property)
// Note: don't use this in cases where 'undefined' is a possible value for your properties