Future<T>.value constructor
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.value, even if the name suggests otherwise.
If value
is not a Future, the created future is completed
with the value
value,
equivalently to new Future<T>.sync(() => value)
.
Use Completer to create a future and complete it later.
Implementation
factory Future.value([FutureOr<T> value]) {
return new _Future<T>.immediate(value);
}