// before the call
let menu = {
  width: 200,
  height: 300,
  title: "My menu"
};

multiplyNumeric(menu);

// after the call
menu = {
  width: 400,
  height: 600,
  title: "My menu"
};

function multiplyNumeric(menu){
    for(prop in menu){
        if(typeof menu[prop] == 'number'){
            menu[prop] *= 2;
        }
    }
}