Q21. What are Kotlin coroutines and when should you use them?
Coroutines are Kotlin's solution for asynchronous and concurrent code. They are lightweight, suspendable computations: a `suspend` function can pause without blocking a t...
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Q22. What is the GIL and how does it affect concurrency?
The Global Interpreter Lock is a mutex in CPython that allows only one thread to execute Python bytecode at a time. Consequences: - CPU-bound multithreading does not get ...
Q23. How do you narrow a union type?
Narrowing reduces a union to a subset within a control-flow branch. Techniques: - typeof for primitives. - instanceof for classes. - The in operator for property presence...
Q24. How do you handle a sprint that is going to miss its goal?
I surface it early rather than hoping. Transparency is more valuable than protecting appearances, and late surprises are worse than early honesty. First I look at why. Is...
Q25. How do you qualify a deal using a framework like BANT or MEDDIC?
BANT and MEDDIC are qualification frameworks that force honesty about whether a deal is real. BANT covers Budget, Authority, Need and Timing. It is simple and useful for ...
Q26. How do you implement a distributed lock with Redis?
A common implementation is SET key value NX PX ttl. NX sets the key only if it does not exist, and PX gives the lock an expiry so a crashed holder cannot deadlock the sys...
Q27. How do pipes and redirection work?
Every process has three standard streams: stdin (0), stdout (1) and stderr (2). Redirection connects them to files or other processes. ```bash cmd > out.log # stdout to f...
Q28. What are extension functions and what are their limitations?
An extension function adds a method to a class without modifying or inheriting it. Resolution is static. ```kotlin fun String.toTitleCase(): String = split(" ").joinToStr...
Q29. List vs dictionary comprehension performance and readability.
Comprehensions are typically faster than an equivalent for-loop with append because the iteration runs in optimised bytecode without repeated method lookups. ```python sq...
Q30. What is polymorphism and what forms does it take?
Polymorphism lets one interface be used by many implementations, so callers depend on a contract rather than a concrete type. Subtype or runtime polymorphism: a base refe...