Is Flutter app is single or muti threaded?

Dart/Flutter is single threaded and not possible to share global variable. As each isolate has its own memory, space and everything. To make it work like multi-threaded you have to use isolates and the communication will be used through ports by sending message to one another .

Future in Flutter or Dart gives us a promise token and returns a value at in future. Flutter is mainly single thread .

To create new Threads/Isolates, we need to import ‘package:flutter/foundation. dart’ . Imagine you have a function that sleeps for 10 seconds in the Flutter build method the UI would be blocked until the 10 seconds elapse.27 Eyl 2021