Conceptual

What are the benefits of using hooks in React?
How does the box model work in CSS?
call( ) vs apply( )
call( ) vs bind( )
CSR vs SSR
Explain the composition pattern in React
What is the CSS display property and what are examples of its use?
What is CSS selector specificity and how does it work?
What is event delegation in JavaScript?
What is event loop?
How to improve website performance?
What are the rules of React hooks?
this keyword in JavaScript
What happens when the useState setter function is called in React?
var vs let vs const
Virtual DOM in React
What does preventDefault() do?
What happens when you type a URL into a browser and hit enter?
What is a closure in JavaScript?
What is AB Testing?
What is the event loop in JavaScript?
What is Responsive Design?
Why does React recommend against mutating state?
What is the use of aria-label, aria-labelledby, and aria-live?
async vs defer
Code Splitting
How does positioning work in CSS?
What is dangerouslySetInnerHTML in React?
What is difference between a map object and a plain object in JavaScript?
== vs ===
What are error boundaries in React?
What are ES2015 classes and how do they differ from ES5 function constructors?
Describe event capturing in JavaScript
What is forwardRef() in React?
Garbage Collection
What are iterators and generators in JavaScript?
key prop in react
What are the differences between Map/Set and WeakMap/WeakSet?
What is the difference between mouseenter and mouseover?
Object Comparison Output
What are JavaScript object getters and setters?
Optimize Rendering Large Datasets
Explain the presentational vs container component pattern
preventDefault() vs stopPropagation()
What are some common React anti-patterns?
What are React Fragments used for?
What is the difference between React Node, React Element, and React Component?
How do you decide between React state, context, and external state managers?
What is React Suspense?
What are render props in React?
How do you reset a component state in React?
What are server-sent events?
translate vs absolute positioning
What is tree shaking?
Arrow functions
What is cookie?
What is hoisting in JavaScript?
What are workers in JavaScript?
What is an anonymous function and when would you use it?
box-sizing: border-box
Centering Elements in Webpages
What is a static method in a class?
Content Security Policy (CSP)
Cross Origin Resource Sharing (CORS)
Cross-Site Scripting (XSS)
What data structure is used to represent the DOM?
default vs named export
Difference between global scope, function scope, and block scope
How to prevent the UI from blocking during a long running task?
HTTP Methods
Image Failures in Production
inline vs inline-block vs block
How do you destructure nested objects?
null vs undefined vs undeclared
What are JavaScript object property flags and descriptors?
Primitive vs Reference
Proxies in JavaScript
What is React Fiber?
Reference vs Syntax Error
Role of semantic HTML in accessibility
What is semantic HTML?
How would you test a React application?
useEffect vs useLayoutEffect
What are Web Vitals?
What is callback hell?
What is Immutability?
Why is input validation important?
What is the Beacon API?
Critical Rendering Path
What is doctype in HTML?
What is a higher order function?
How do you create a constructor function?
How would you style an SVG?
How would you implement dark mode and light mode?
What is inversion of control?
Reset vs Normalize CSS
state vs props
What is Test Driven Development?
How to truncate text using CSS only
What does typeof operator do?
use strict
What is array destructuring?
What is an async thunk?
What is object destructuring?
What is singleton pattern?
What is TDZ in JavaScript?
What is a thunk?
Where Do We Use Observer Pattern in Frontend Development?
Why do we use polyfills?
Why are functions first-class objects?
Passing function to initial state
How to scope the type of generic?
stopPropagation() vs stopImmediatePropagation()
What is a symbol type?
sync vs async function
Can callbacks be synchronous?
useTransition vs useDeferredValue

HTML

What is doctype in HTML in start of HTML file?

What is doctype in HTML in start of HTML file?

DOCTYPE HTML

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