When to use `return` in arrow function (`()=>()` or `()=>{}`)

[MayHyeyeonKim]

When we write an arrow function in JS, sometimes we need to use return to tell the function what to give back, and other times, we dont.

• if we use { } (curly braces) in our arrow function, we must use return.

  hospitals.map(hospital => {
  return (
  <Marker
    key={hospital.id}
    latitude={hospital.latitude}
    longitude={hospital.longitude}
  />
  );
  });

• if we use ()(parentheses) without { }, we dont need to use return. This is called implicit return, and it works when you have a simple, one-line expression. The function automatically returns the value.

  hospitals.map(hospital => (
  <Marker
  key={hospital.id}
  latitude={hospital.latitude}
  longitude={hospital.longitude}
  />
  ));