What is the difference in these Future consructors?
It seems they do and act the same way and the results are identical, arn't they?
Future<double> future1 = Future(() => 36.6);
Future<double> future2 = Future.value(36.6);
What is the difference in Future consructors?
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1 Answers
Future(callback) gives the DOM time to react and doesn't go into the runAsync queue.
Future.value(value) behaves like a Future that was completed earlier (it's completely valid to keep these Future.values around instead of creating a new one every time) and it does go into the runAsync queue.
Have a look on the example below (it returns 1,2,4,3 instead of 1,2,3,4):
void main() {
Future.value().then((_) {
print(1);
Future(() => print(3));
});
Future.value().then((_) {
print(2);
Future.value().then((_) => print(4));
});
}
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