Q571. What is the Global VM Lock and how does it affect concurrency?
MRI, the standard Ruby implementation, has a Global VM Lock: only one thread executes Ruby bytecode at a time, so threads do not provide CPU parallelism for pure Ruby cod...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
Q572. How does copy-on-write work for Swift collections?
Swift collections such as `Array`, `Dictionary` and `String` are value types with copy-on-write. Copying a variable is cheap because both copies share the same buffer unt...
Q573. Explain declaration-site variance with in and out.
Variance describes how generic types relate when their type arguments are related. `out T` (covariant) means `Producer` can be used where `Producer` is expected. `in T` (...
Q574. 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...
Q575. Explain the rule of three, five and zero, plus undefined behaviour.
The rule of three: if a class needs a custom destructor, copy constructor or copy assignment operator, it probably needs all three, because they manage the same resource....
Q576. 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...
Q577. How do you choose between mutexes and channels for concurrency?
Go's advice is "do not communicate by sharing memory; share memory by communicating", but both tools are legitimate. - Use a mutex when protecting a small piece of shared...
Q578. Which are valid SQL comments?
SQL supports both single-line and multi-line commenting syntax across relational database engines: ### 1. Single-Line Standard Comment (`--`): The official ANSI SQL stand...
Q579. How Python is interpreted?
Python language is an interpreted language. Python program runs directly from the source code. It converts the source code that is written by the programmer into an inter...
Q580. What are different types of list in HTML?
HTML provides three primary elements for structuring lists of items, each serving a distinct semantic role: ### 1. Unordered Lists (``) Used for collections of items wher...