JS/Q/1

my = {
    each: function(collection, callback) {
            if(collection instanceof Array) {
                for(i = 0; i < collection.length; i++) {
                    callback.call(collection[i], i, collection[i]);
                }
            } else {
                for(propi in collection) {
                    if(collection.hasOwnProperty(propi)) {
                        callback.call(collection[propi], propi, collection[propi]) ;
                    }
                }

            }

            return collection;
        }
};

Object.prototype.each = function(callback){
    return my.each(this, callback);
};