A shallow object similarity checker. Not revolutionary, or even that good..

isSimilar.js

function isSimilar( o1, o2 ) {
    var similar = true,
        prop    = null;
    for( prop in o1 ) {
        if ( o1.hasOwnProperty( prop ) ) {
            similar &= ( o2.hasOwnProperty( prop ) && o1[prop] === o2[prop] );
        } else {
            return false;
        }
    }
    return similar;
}