[Flutter] FutureBuilder

It's a widget for displaying a widget received through a Future.
Its arguments are future and builder.

If you pass a function that returns a Future to the future argument,
inside builder you can get the widget returned by that function through snapshot.data.

FutureBuilder(
          future: getMedicine(itemName: "타이레ㅇㄹ놀", idx: 0),
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            //This part runs when the data hasn't been received yet.
            if (snapshot.hasData == false) {
              return const CircularProgressIndicator();
            }
            //The part returned when an error occurs
            else if (snapshot.hasError) {
              return Widget;
            }
            // When the data is received normally, this part runs.
            else {
              return Widget;
            }
          },
        ),

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