function StarWar(props) {

    if (props.value != 0) {
        //I want to pass the props.others like a properties to the class Battle

        function testing(){
            //Tuka post metod
            //response = data.id
            //localStorage.setItem('battleid', JSON.stringify(id));

            console.log('yeaaaaaaaaaaaaaaaaaaaaaa');
        }

        return <div><button className="btn btn-warning"
         onClick={() => testing()}>
        </button>
        </div>
    }
    else {
       ...
    }
}