gab

render: function(){
            var chicken = this //means to whatever
            var filter = items.filter(function(item){
               return ((item.category === chicken.props.category) && item.name.indexOf(chicken.props.query) !== -1)
               //means when evaluating eg <DataRow category={"Electronics"}/> above, this.props.category is Electronics
               //have to use chicken instead of this because this would refer to what called it, ie var filter function.
            })