Coroutines

1. Fill-in-the-blanks

   Enter one or more words to complete the sentence.

   The ___ thread, sometimes called the UI thread, is responsible for updating the screen in an Android app.

2. Which of the following are some of the pitfalls of directly using threads in your code?

   Choose as many answers as you see fit.

   Race conditions

   Inconsistent output

   Unresponsive UI

   Thread is deprecated

3. Which statement below is true about coroutines?

   Once started, a coroutine cannot be canceled.

   A coroutine always runs on the main thread.

   A coroutine may or may not execute.

   Coroutines avoid the need to create new threads, by running every task on the same thread.

4. True or False: If a function already calls a suspend function, then it does not need to be marked as a suspend function itself.

   True

   False

5. Which of the following are suspend functions?.

   Choose as many answers as you see fit.

   async()

   The lambda passed into async()

   runBlocking()

   The lambda passed into runBlocking()

6. Which statement below is false about async() and runBlocking()?

   Both functions take a CoroutineScope (a suspend function) as a parameter.

   Both functions return a Deferred

   You'll typically not use runBlocking in Android app code.

   When using async, you need to use await() to access the returned value.

7. True or False: In most apps, you would create coroutines using the global scope.

   True

   False

8. What is responsible for determining which thread is used behind the scenes by a coroutine?

   CoroutineScope

   Dispatcher

   Job

   GlobalScope

9. Fill-in-the-blanks

   Enter one or more words to complete the sentence.

   A ___ is similar to a promise or future in other languages and serves as a placeholder for a return value.

10. True or False: A Job is a cancelable unit of work performed by a coroutine.

    True

    False

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