And then is use one by one step of code, store data in variable and then move to next . Example: If I click in follow button until data store in variable it continuously retrieve some data to store and not allow next function to run, and if one task is complete than move to another.4 Şub 2019
Read moreWhen complete vs then Flutter?
. whenComplete will fire a function either when the Future completes with an error or not, instead . then will fire a function after the Future completes without an error. This is the asynchronous equivalent of a “finally” block.
Read moreHow do you use Future then in flutter?
A Future is defined exactly like a function in Dart, but instead of Void you use Future. If you want to return a value from Future, then you pass it a Type .
Read moreWhat is then in Dart?
then<R> method Null safety Register callbacks to be called when this future completes . When this future completes with a value, the onValue callback will be called with that value. If this future is already completed, the callback will not be called immediately, but will be scheduled in a later microtask.
Read moreWhat is a Dart snapshot?
A Dart snapshot is just a binary serialization of the token stream, generated from parsing the code . A snapshot is not a “snapshot of a running program”, it’s generated before the tokens are turned into machine code. So, no program state is captured in a snapshot.
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 .
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 .
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