Q491. When would you choose an interface over an abstract class?
Both define contracts that other types implement, but they differ in intent and mechanics. - An interface declares a contract with no state (traditionally) and supports m...
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Q492. What is const correctness and why does it matter?
`const` is a compile-time contract. A `const` object cannot be modified, and a `const` member function promises not to modify the object, so it can be called on const obj...
Q493. How do you implement a custom iterator in Rust?
You implement the `Iterator` trait by providing `next`, which returns `Option`. ```rust struct Counter { count: u32, max: u32 } impl Iterator for Counter { type Item = u3...
Q494. How does defer work in Go and what are the common pitfalls?
`defer` schedules a function call to run when the surrounding function returns. Deferred calls run in LIFO order and are typically used for cleanup such as closing files ...
Q495. Which data type for distance rounded to the nearest mile?
When storing distance rounded to the nearest whole mile, an **integer data type** is the optimal choice: ```sql ALTER TABLE travel_logs ADD COLUMN distance_miles INT NOT ...
Q496. What is PEP 8?
**PEP 8** (Python Enhancement Proposal 8) is the official style guide for writing clean, readable, and maintainable Python code, authored in 2001 by Guido van Rossum, Bar...
Q497. What is output escaping and why is it important?
Output escaping encodes user-controlled data at the moment it is written into HTML so browsers treat it as text, not markup. This is the primary defence against XSS. ```p...
Q498. What is the purpose of Doctype in HTML?
The Doctype declaration specifies the type of document being used and tell the web browser how to interpret the pages content. It is located at the top of the HTML docume...
Q499. What are the benefits of using TypeScript?
The benefits of using TypeScript include enhanced code quality through static typing, improved developer productivity with better tooling and autocompletion, increased ma...
Q500. How do you compare Object and Map?
**Objects** and **Maps** both allow you to associate keys with values, retrieve those values, delete keys, and check if a key exists. Historically, Objects have been used...