How can I effectively use Haskell's async library for composition?

How can I effectively use Haskell's async library for composition?

You can use the async library to compose asynchronous tasks by leveraging functions like async, wait, and waitAny. Would you like an example?

Yes, please provide an example of composing multiple async tasks.

Sure! Here's a simple example:

import Control.Concurrent.Async

main :: IO ()
main = do
    a1 <- async (task1)
    a2 <- async (task2)
    result <- waitBoth a1 a2
    print result

task1 :: IO String
task1 = do
    -- Simulate a task
    return "Result from task 1"

task2 :: IO String
task2 = do
    -- Simulate another task
    return "Result from task 2"

This code runs task1 and task2 concurrently and waits for both to complete.

What if I want to handle exceptions in these async tasks?

You can use waitCatch instead of wait to handle exceptions. It returns an Either type, allowing you to check for errors. Would you like to see an example?

Yes, that would be helpful!