You are building a real-time chat app. Why choose WebSockets over HTTP polling?
React Rendering
Your React component re-renders unnecessarily when props don’t change. What should you use?
A database must handle complex joins and enforce strict data relationships between tables. Which choice best satisfies this requirement?
A backend service must handle thousands of concurrent requests efficiently without blocking while waiting for database responses. Which design choice best supports this?
A user interface updates automatically when underlying data changes, without manually manipulating the DOM. What enables this behavior?
A developer structures the app so that business logic, data handling, and presentation are clearly separated. What is the main benefit of this approach?
In an MVC application, where should business logic reside?
A deployment pipeline automatically runs tests and blocks releases if any test fails.What is the primary benefit?
Your API must clearly define how clients should interact with resources using standard conventions. What principle ensures this consistency?
A developer exposes sensitive credentials directly in the frontend bundle, which becomes visible in the browser. What is the correct preventive measure?
Your application state must be shared across multiple deeply nested components without passing props at every level. What is the best solution?
You want to release breaking API changes without affecting existing clients. What’s the best approach?
A button on a web page should display a confirmation message only after the user clicks it, without reloading the page. Which approach best achieves this?
A request updates only one field of an existing resource instead of replacing the entire object. Which HTTP method is most appropriate?
You need to validate API endpoints automatically after every code change to ensure they still behave correctly. What is the best practice?
You need to create a responsive layout where items wrap automatically based on screen size. Which CSS solution is best?
A landing page looks correct on desktop but breaks on mobile because elements overflow the screen. You need a solution that adapts layouts based on screen size without duplicating markup. What is the best approach?
Your app stores user profiles with varying fields that may change frequently over time. Which data storage approach is most flexible?
An API returns different responses based on whether a requested resource exists or not. Which status code should be returned when the resource is missing?
An endpoint is designed to fetch a list of users. Calling it multiple times with the same request should not change server data. Which HTTP method best fits this behavior?
A component re-renders unnecessarily whenever its parent updates, even though its data hasn’t changed. This is causing performance issues.What is the most appropriate fix?
You want to reduce the number of database queries made during repeated API requests for the same data. What strategy helps most?
An application works on one machine but fails on another due to environment differences. What is the best way to ensure consistent behavior everywhere?
