Q1. How does async/await work in C#?
`async`/`await` enables asynchronous programming without blocking a thread. Marking a method `async` lets you `await` a `Task` or `Task`, and the compiler rewrites the me...
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Q2. How do you handle errors in asynchronous Node.js code?
For promises and async functions use try/catch and let errors propagate to a central handler: ```js app.get('/users/:id', asyncHandler(async (req, res) => { const user = ...
Q3. How do async/await, tasks and actors support structured concurrency?
Swift's structured concurrency builds on `async`/`await`, `Task` and `TaskGroup`. An `async` function can suspend without blocking a thread, and `await` marks a potential...
Q4. What causes async deadlocks and how does ConfigureAwait help?
A classic deadlock happens in UI applications and classic ASP.NET when you block synchronously on async code with `.Result` or `.Wait()`. The awaited task wants to resume...
Q5. How do async/await, futures, Send and Sync fit together?
An `async fn` returns a `Future`, a state machine that does nothing until polled. An executor such as Tokio drives it. `.await` yields control while the future is pending...
Q6. How do you model a long-running operation in REST?
Do not hold the connection open. Instead accept the work and return 202 Accepted with a pointer to a status resource. ```http POST /reports Location: /reports/jobs/789 Re...
Q7. What is a promise?
A **Promise** is a JavaScript object that represents the eventual completion (or failure) of an asynchronous operation and its resulting value. It acts as a placeholder f...
Q8. Why do you need a promise?
Promises are **used to handle asynchronous operations**, especially in languages like JavaScript, which often work with non-blocking operations such as network requests, ...
Q9. What is a callback hell?
Callback Hell is an anti-pattern with multiple nested callbacks which makes code hard to read and debug when dealing with asynchronous logic. The callback hell looks like...
Q10. What is promise chaining?
The process of executing a sequence of asynchronous tasks one after another using promises is known as Promise chaining. Let's take an example of promise chaining for cal...