Compare objects

gistfile1.js

var toString = Object.protototype.toString

function objectEquals(x, y) {
    // anything that's strictly equal is good
    if(x === y) return true;
    
    // at this point any falsy values will not be equal
    if(!x || !y) return false;
    
    // valueOf should work for dates
    if (x.valueOf() === y.valueOf()) { return true; }

    // if one of them is date, they must had equal valueOf
    if (x instanceof Date) { return false; }
    if (y instanceof Date) { return false; }

    // if they are not function or strictly equal, they both need to be Objects
    if (!(x instanceof Object)) { return false; }
    if (!(y instanceof Object)) { return false; }

    var p = Object.keys(x);
    return Object.keys(y).every(function (i) { return p.indexOf(i) !== -1; }) ?
            p.every(function (i) { return objectEquals(x[i], y[i]); }) : false;
}