In asynchronous execution by the .async method, the method call returns immediately, ordering the task to be done but not waiting for it to finish.
Use .async when your app does not need to wait until the operation inside the block is finished.
long-running tasks such as image/data processing, local or remote data fetching, and other network calls are typically good candidates for running tasks .async.
In synchronous execution by .sync method, the current thread waits until the task is finished before the method call returns.
Use .sync when your app needs to wait until a task is finished.
Example scenarios include:
- to ensure a particular function is not called a second time before its first invocation is finished.
- to wait for an operation inside a block to finish before you can use the data processed by the block.