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
Read moreWhat is Future or null?
FutureOr<T> class Null safety A type representing values that are either Future<T> or T . This class declaration is a public stand-in for an internal future-or-value generic type, which is not a class type.
Read moreWhat is Future void in Flutter?
If a future doesn’t produce a usable value , then the future’s type is Future<void> . A future can be in one of two states: uncompleted or completed. When you call a function that returns a future, the function queues up work to be done and returns an uncompleted future.
Read moreHow do you use Future in widget Flutter?
Flutter – FutureBuilder Widget
Read moreHow do you get data from Future object Flutter?
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 .
Read moreWhat does async do?
The word “async” before a function means one simple thing: a function always returns a promise. Other values are wrapped in a resolved promise automatically. So, async ensures that the function returns a promise, and wraps non-promises in it .
Read moreWhat is Future async and await in Flutter?
Async means that this function is asynchronous and you might need to wait a bit to get its result. Await literally means – wait here until this function is finished and you will get its return value. Future is a type that ‘comes from the future’ and returns value from your asynchronous function .
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