Search bar suggestion dropdown

function App () {
const [selected,setSelected] = useState(0);
const [inpValue, setInpValue] = useState("");
return (
  <Suggestions selected={selected} inpValue={inpValue}>
    <input value={inpValue}
     onChange={(evt)=>{
        setInpValue(evt.target.value)
      }}  
      onKeyDown = {evt=>{
        // make sure to check for borders of the             list
        //if key === arrow up
          setSelected(selected++);
        
        //if key === arrow down
          setSelected(selected--); 
      }
     />
  </Suggestions>
)
}

function Suggestions(selected, inpValue) {
  const sugg = [];
  // get the suggestions
  return (
    <Dropdown>
      {sugg.map((el, index) => {
        return (
          <div key={el.id} className={selected === index ? "selected" : ""}>
            {el.title}
          </div>
        );
      })}
    </Dropdown>
  );
}