blah.js

const saveStuffToBackend = stuff => {
  saveToBackend(stuff);
}

const genRowPartial = (foo) => (bar) => {
  const [baz, setBaz] = useState(0);
  
  return (
    <tr><td><input value={baz} onChange={e => setBaz(e.target.value)} onBlur={() => saveStuffToBackend(baz)} /></td></tr>
  );
 }
 
 const MyComponent = props => {
  const genRow = genRowPartial(props.stuff);
 
  return (
    <table><tbody>
    {props.stuff.map(el => genRow(el))}
    </tbody></table>
  );
 }