Essentially, by making some function f() return a Future<Null> , you are making await f() a synonym of null in your program ! That’s dangerous because you can use null as if it were absolutely anything, absolutely any type.30 Eki 2018
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Flutter – FutureBuilder Widget
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get() method returns a Future object : 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<T> means that the result of the asynchronous operation will be of type T .
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Future<T>. value constructor Null safety Creates a future completed with value . If value is a future, the created future waits for the value future to complete, and then completes with the same result . Since a value future can complete with an error, so can the future created by Future.
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