Q111. Explain middleware in Express.
Middleware are functions with the signature (req, res, next) that run in order and can inspect or modify the request/response, end the cycle, or pass control with next()....
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Q112. What is JSON and its common operations?
**JSON (JavaScript Object Notation)** is a lightweight, text-based data format that uses JavaScript object syntax for structuring data. It was popularized by Douglas Croc...
Q113. What is the difference between an Element and a Component?
**Element:** - A React **Element** is a plain JavaScript object that describes what you want to see on the UI. It represents a DOM node or a component at a specific point...
Q114. What is a stakeholder analysis and how do you do one?
Stakeholder analysis identifies the people who affect or are affected by a change, and works out how to engage them. I start by listing everyone: users, managers, IT, fin...
Q115. What is an MVP and how do you scope one?
An MVP is the smallest thing we can build that lets us test our most important assumption with real users and learn from their behaviour. The key word is learning, not ch...
Q116. What is an SLA and how do you work within one?
An SLA, or service level agreement, is a commitment about the level of service a customer can expect. It usually defines response times and resolution targets for differe...
Q117. What is the difference between vanity metrics and actionable metrics?
Vanity metrics look impressive but do not guide decisions: total registered users, page views, cumulative downloads. They only go up, lack context and cannot be tied to a...
Q118. What is MySQL, and how does it differ from SQL?
**SQL** is the *language* (like English). **MySQL** is a *database system* that *speaks* SQL (like a person who speaks English). Analogy: SQL is the recipe; MySQL is the ...
Q119. 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...
Q120. What do utility types like Partial, Pick, Omit and Record do?
They transform existing types, avoiding duplication. ```ts interface User { id: number; name: string; email: string; } Partial; // all props optional Required; // all pro...