Flutter how to use Future return value as if variable

Question

I want to get Future return value and use it like variable. I have this Future function

  Future _fetchUserInfo(String id)          


        

Answer 1

Just adding more explanation/description over the above answers

When a function returns a Future, it means that it takes a while for its result to be ready, and the result will be available in the future.

Calling a function that returns a Future, will not block your code, that’s why that function is called asynchronous. Instead, it will immediately return a Future object, which is at first uncompleted.

Future means that the result of the asynchronous operation will be of type T. For example, if a function returns Future, this means that in the future, it will provide a string to you.

The result of the Future is available only when the Future is completed. You can access the result of the Future using either of the following keywords:

1. then

2. await

Suppose that the getNews function returns an instance of Future.

Future getNews() async {
  final response = await http.get(url);
  return response.body;
}

You can consume the result of this function in either of the following ways:

getNews().then((news) {
  print(news);
});

or

String news = await getNews();
print(news);

Note that the await keyword can only be used in the body of an async function:

Future foo() async {
  String news = await getNews();
  print(news);
}

The result of an async function must be a Future.

Credit and For more info, see: https://medium.com/@meysam.mahfouzi/understanding-future-in-dart-3c3eea5a22fb