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.
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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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