1. What is Callback hell ? Junior A. a standard way to cancel async operations like fetch or timers via a shared signal B. running independent async tasks concurrently and awaiting all of their results C. deeply nested callbacks that hurt readability, mitigated by promises and async/await D. a rejected promise with no catch handler, which can terminate the process
2. Which term means: "deeply nested callbacks that hurt readability, mitigated by promises and async/await"? Junior A. Callback hell B. util.promisify C. AbortController D. Graceful shutdown
3. Which statement is correct? Junior A. Callback hell — running independent async tasks concurrently and awaiting all of their results B. Callback hell — a standard way to cancel async operations like fetch or timers via a shared signal C. Callback hell — deeply nested callbacks that hurt readability, mitigated by promises and async/await D. Callback hell — wraps a Node callback-style function so it returns a promise
4. What is util.promisify ? Mid A. running independent async tasks concurrently and awaiting all of their results B. wraps a Node callback-style function so it returns a promise C. deeply nested callbacks that hurt readability, mitigated by promises and async/await D. a rejected promise with no catch handler, which can terminate the process
5. Which term means: "wraps a Node callback-style function so it returns a promise"? Mid A. Graceful shutdown B. Unhandled rejection C. util.promisify D. Parallel with Promise.all
6. Which statement is correct? Mid A. util.promisify — deeply nested callbacks that hurt readability, mitigated by promises and async/await B. util.promisify — a rejected promise with no catch handler, which can terminate the process C. util.promisify — a standard way to cancel async operations like fetch or timers via a shared signal D. util.promisify — wraps a Node callback-style function so it returns a promise
7. What is Unhandled rejection ? Senior A. wraps a Node callback-style function so it returns a promise B. running independent async tasks concurrently and awaiting all of their results C. deeply nested callbacks that hurt readability, mitigated by promises and async/await D. a rejected promise with no catch handler, which can terminate the process
8. Which term means: "a rejected promise with no catch handler, which can terminate the process"? Senior A. AbortController B. util.promisify C. Unhandled rejection D. Parallel with Promise.all
9. Which statement is correct? Senior A. Unhandled rejection — closing servers and connections on SIGTERM before the process exits B. Unhandled rejection — running independent async tasks concurrently and awaiting all of their results C. Unhandled rejection — a rejected promise with no catch handler, which can terminate the process D. Unhandled rejection — a standard way to cancel async operations like fetch or timers via a shared signal
10. What is Parallel with Promise.all ? Mid A. closing servers and connections on SIGTERM before the process exits B. deeply nested callbacks that hurt readability, mitigated by promises and async/await C. running independent async tasks concurrently and awaiting all of their results D. wraps a Node callback-style function so it returns a promise
11. Which term means: "running independent async tasks concurrently and awaiting all of their results"? Mid A. Graceful shutdown B. Parallel with Promise.all C. AbortController D. Unhandled rejection
12. Which statement is correct? Mid A. Parallel with Promise.all — deeply nested callbacks that hurt readability, mitigated by promises and async/await B. Parallel with Promise.all — wraps a Node callback-style function so it returns a promise C. Parallel with Promise.all — a rejected promise with no catch handler, which can terminate the process D. Parallel with Promise.all — running independent async tasks concurrently and awaiting all of their results
13. What is Graceful shutdown ? Senior A. deeply nested callbacks that hurt readability, mitigated by promises and async/await B. closing servers and connections on SIGTERM before the process exits C. running independent async tasks concurrently and awaiting all of their results D. a rejected promise with no catch handler, which can terminate the process
14. Which term means: "closing servers and connections on SIGTERM before the process exits"? Senior A. Graceful shutdown B. Unhandled rejection C. util.promisify D. Parallel with Promise.all
15. Which statement is correct? Senior A. Graceful shutdown — a standard way to cancel async operations like fetch or timers via a shared signal B. Graceful shutdown — wraps a Node callback-style function so it returns a promise C. Graceful shutdown — closing servers and connections on SIGTERM before the process exits D. Graceful shutdown — running independent async tasks concurrently and awaiting all of their results
16. What is AbortController ? Mid A. wraps a Node callback-style function so it returns a promise B. closing servers and connections on SIGTERM before the process exits C. deeply nested callbacks that hurt readability, mitigated by promises and async/await D. a standard way to cancel async operations like fetch or timers via a shared signal
17. Which term means: "a standard way to cancel async operations like fetch or timers via a shared signal"? Mid A. AbortController B. Unhandled rejection C. Parallel with Promise.all D. util.promisify
18. Which statement is correct? Mid A. AbortController — running independent async tasks concurrently and awaiting all of their results B. AbortController — a standard way to cancel async operations like fetch or timers via a shared signal C. AbortController — closing servers and connections on SIGTERM before the process exits D. AbortController — wraps a Node callback-style function so it returns a promise