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Microsoft :- https://pdlink.in/4iq8QlM
Infosys :- https://pdlink.in/4jsHZXf
IBM :- https://pdlink.in/3QyJyqk
Cisco :- https://pdlink.in/4fYr1xO
Enroll For FREE & Get Certified ๐
โค1
Master Javascript :
The JavaScript Tree ๐
|
|โโ Variables
| โโโ var
| โโโ let
| โโโ const
|
|โโ Data Types
| โโโ String
| โโโ Number
| โโโ Boolean
| โโโ Object
| โโโ Array
| โโโ Null
| โโโ Undefined
|
|โโ Operators
| โโโ Arithmetic
| โโโ Assignment
| โโโ Comparison
| โโโ Logical
| โโโ Unary
| โโโ Ternary (Conditional)
||โโ Control Flow
| โโโ if statement
| โโโ else statement
| โโโ else if statement
| โโโ switch statement
| โโโ for loop
| โโโ while loop
| โโโ do-while loop
|
|โโ Functions
| โโโ Function declaration
| โโโ Function expression
| โโโ Arrow function
| โโโ IIFE (Immediately Invoked Function Expression)
|
|โโ Scope
| โโโ Global scope
| โโโ Local scope
| โโโ Block scope
| โโโ Lexical scope
||โโ Arrays
| โโโ Array methods
| | โโโ push()
| | โโโ pop()
| | โโโ shift()
| | โโโ unshift()
| | โโโ splice()
| | โโโ slice()
| | โโโ concat()
| โโโ Array iteration
| โโโ forEach()
| โโโ map()
| โโโ filter()
| โโโ reduce()|
|โโ Objects
| โโโ Object properties
| | โโโ Dot notation
| | โโโ Bracket notation
| โโโ Object methods
| | โโโ Object.keys()
| | โโโ Object.values()
| | โโโ Object.entries()
| โโโ Object destructuring
||โโ Promises
| โโโ Promise states
| | โโโ Pending
| | โโโ Fulfilled
| | โโโ Rejected
| โโโ Promise methods
| | โโโ then()
| | โโโ catch()
| | โโโ finally()
| โโโ Promise.all()
|
|โโ Asynchronous JavaScript
| โโโ Callbacks
| โโโ Promises
| โโโ Async/Await
|
|โโ Error Handling
| โโโ try...catch statement
| โโโ throw statement
|
|โโ JSON (JavaScript Object Notation)
||โโ Modules
| โโโ import
| โโโ export
|
|โโ DOM Manipulation
| โโโ Selecting elements
| โโโ Modifying elements
| โโโ Creating elements
|
|โโ Events
| โโโ Event listeners
| โโโ Event propagation
| โโโ Event delegation
|
|โโ AJAX (Asynchronous JavaScript and XML)
|
|โโ Fetch API
||โโ ES6+ Features
| โโโ Template literals
| โโโ Destructuring assignment
| โโโ Spread/rest operator
| โโโ Arrow functions
| โโโ Classes
| โโโ let and const
| โโโ Default parameters
| โโโ Modules
| โโโ Promises
|
|โโ Web APIs
| โโโ Local Storage
| โโโ Session Storage
| โโโ Web Storage API
|
|โโ Libraries and Frameworks
| โโโ React
| โโโ Angular
| โโโ Vue.js
||โโ Debugging
| โโโ Console.log()
| โโโ Breakpoints
| โโโ DevTools
|
|โโ Others
| โโโ Closures
| โโโ Callbacks
| โโโ Prototypes
| โโโ this keyword
| โโโ Hoisting
| โโโ Strict mode
|
| END __
The JavaScript Tree ๐
|
|โโ Variables
| โโโ var
| โโโ let
| โโโ const
|
|โโ Data Types
| โโโ String
| โโโ Number
| โโโ Boolean
| โโโ Object
| โโโ Array
| โโโ Null
| โโโ Undefined
|
|โโ Operators
| โโโ Arithmetic
| โโโ Assignment
| โโโ Comparison
| โโโ Logical
| โโโ Unary
| โโโ Ternary (Conditional)
||โโ Control Flow
| โโโ if statement
| โโโ else statement
| โโโ else if statement
| โโโ switch statement
| โโโ for loop
| โโโ while loop
| โโโ do-while loop
|
|โโ Functions
| โโโ Function declaration
| โโโ Function expression
| โโโ Arrow function
| โโโ IIFE (Immediately Invoked Function Expression)
|
|โโ Scope
| โโโ Global scope
| โโโ Local scope
| โโโ Block scope
| โโโ Lexical scope
||โโ Arrays
| โโโ Array methods
| | โโโ push()
| | โโโ pop()
| | โโโ shift()
| | โโโ unshift()
| | โโโ splice()
| | โโโ slice()
| | โโโ concat()
| โโโ Array iteration
| โโโ forEach()
| โโโ map()
| โโโ filter()
| โโโ reduce()|
|โโ Objects
| โโโ Object properties
| | โโโ Dot notation
| | โโโ Bracket notation
| โโโ Object methods
| | โโโ Object.keys()
| | โโโ Object.values()
| | โโโ Object.entries()
| โโโ Object destructuring
||โโ Promises
| โโโ Promise states
| | โโโ Pending
| | โโโ Fulfilled
| | โโโ Rejected
| โโโ Promise methods
| | โโโ then()
| | โโโ catch()
| | โโโ finally()
| โโโ Promise.all()
|
|โโ Asynchronous JavaScript
| โโโ Callbacks
| โโโ Promises
| โโโ Async/Await
|
|โโ Error Handling
| โโโ try...catch statement
| โโโ throw statement
|
|โโ JSON (JavaScript Object Notation)
||โโ Modules
| โโโ import
| โโโ export
|
|โโ DOM Manipulation
| โโโ Selecting elements
| โโโ Modifying elements
| โโโ Creating elements
|
|โโ Events
| โโโ Event listeners
| โโโ Event propagation
| โโโ Event delegation
|
|โโ AJAX (Asynchronous JavaScript and XML)
|
|โโ Fetch API
||โโ ES6+ Features
| โโโ Template literals
| โโโ Destructuring assignment
| โโโ Spread/rest operator
| โโโ Arrow functions
| โโโ Classes
| โโโ let and const
| โโโ Default parameters
| โโโ Modules
| โโโ Promises
|
|โโ Web APIs
| โโโ Local Storage
| โโโ Session Storage
| โโโ Web Storage API
|
|โโ Libraries and Frameworks
| โโโ React
| โโโ Angular
| โโโ Vue.js
||โโ Debugging
| โโโ Console.log()
| โโโ Breakpoints
| โโโ DevTools
|
|โโ Others
| โโโ Closures
| โโโ Callbacks
| โโโ Prototypes
| โโโ this keyword
| โโโ Hoisting
| โโโ Strict mode
|
| END __
โค16๐1
Typical C++ interview questions sorted by experience
Junior:
- What are the key features of object-oriented programming in C++?
- Explain the differences between public, private, and protected access specifiers in C++.
- Distinguish between function overloading and overriding in C++.
- Compare and contrast abstract classes and interfaces in C++.
- Can an interface inherit from another interface in C++?
- Define the static keyword in C++ and its significance.
- Is it possible to override a static method in C++?
- Explain the concepts of polymorphism and inheritance in C++.
- Can constructors be inherited in C++?
- Discuss pass-by-reference and pass-by-value for objects in C++.
- Compare == and .equals for string comparison in C++.
- Explain the purposes of the hashCode() and equals() functions.
- What does the Serializable interface do? How is it related to Parcelable in Android?
- Differentiate between Array and ArrayList in C++. When would you use each?
- Explain the distinction between Integer and int in C++.
- Define ThreadPool and discuss its advantages over using simple threads.
- Differentiate between local, instance, and class variables in C++.
Mid:
- What is reflection in C++?
- Define dependency injection and name a few libraries. Have you used any?
- Explain strong, soft, and weak references in C++.
- Interpret the meaning of the synchronized keyword.
- Can memory leaks occur in C++?
- Is it necessary to set references to null in C++?
- Why is a String considered immutable?
- Discuss transient and volatile modifiers in C++.
- What is the purpose of the finalize() method?
- How does the try{} finally{} block work in C++?
- Explain the difference between object instantiation and initialization.
- Under what conditions is a static block executed in C++?
- Why are generics used in C++?
- Mention some design patterns you are familiar with. Which do you typically use?
- Name some types of testing methodologies in C++.
Senior:
- Explain how
- What is the "double-check locking" problem, and how can it be solved in C++?
- Differentiate between StringBuffer and StringBuilder in C++.
- How is StringBuilder implemented to avoid the immutable string allocation problem?
- Explain the purpose of the
- Define Autoboxing and Unboxing in C++.
- What's the difference between Enumeration and Iterator in C++?
- Explain the difference between fail-fast and fail-safe in C++.
- What is PermGen in C++?
- Describe a Java priority queue.
- How is performance influenced by using the same number in different types: Int, Double, and Float?
- Explain the concept of the Java Heap.
- What is a daemon thread?
- Can a dead thread be restarted in C++?
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-> https://www.tg-me.com/addlist/4q2PYC0pH_VjZDk5
ENJOY LEARNING ๐๐
Junior:
- What are the key features of object-oriented programming in C++?
- Explain the differences between public, private, and protected access specifiers in C++.
- Distinguish between function overloading and overriding in C++.
- Compare and contrast abstract classes and interfaces in C++.
- Can an interface inherit from another interface in C++?
- Define the static keyword in C++ and its significance.
- Is it possible to override a static method in C++?
- Explain the concepts of polymorphism and inheritance in C++.
- Can constructors be inherited in C++?
- Discuss pass-by-reference and pass-by-value for objects in C++.
- Compare == and .equals for string comparison in C++.
- Explain the purposes of the hashCode() and equals() functions.
- What does the Serializable interface do? How is it related to Parcelable in Android?
- Differentiate between Array and ArrayList in C++. When would you use each?
- Explain the distinction between Integer and int in C++.
- Define ThreadPool and discuss its advantages over using simple threads.
- Differentiate between local, instance, and class variables in C++.
Mid:
- What is reflection in C++?
- Define dependency injection and name a few libraries. Have you used any?
- Explain strong, soft, and weak references in C++.
- Interpret the meaning of the synchronized keyword.
- Can memory leaks occur in C++?
- Is it necessary to set references to null in C++?
- Why is a String considered immutable?
- Discuss transient and volatile modifiers in C++.
- What is the purpose of the finalize() method?
- How does the try{} finally{} block work in C++?
- Explain the difference between object instantiation and initialization.
- Under what conditions is a static block executed in C++?
- Why are generics used in C++?
- Mention some design patterns you are familiar with. Which do you typically use?
- Name some types of testing methodologies in C++.
Senior:
- Explain how
std::stoi
(string to integer) works in C++.- What is the "double-check locking" problem, and how can it be solved in C++?
- Differentiate between StringBuffer and StringBuilder in C++.
- How is StringBuilder implemented to avoid the immutable string allocation problem?
- Explain the purpose of the
Class.forName
method in C++.- Define Autoboxing and Unboxing in C++.
- What's the difference between Enumeration and Iterator in C++?
- Explain the difference between fail-fast and fail-safe in C++.
- What is PermGen in C++?
- Describe a Java priority queue.
- How is performance influenced by using the same number in different types: Int, Double, and Float?
- Explain the concept of the Java Heap.
- What is a daemon thread?
- Can a dead thread be restarted in C++?
โ Best Telegram channels to get free coding & data science resources
-> https://www.tg-me.com/addlist/4q2PYC0pH_VjZDk5
ENJOY LEARNING ๐๐
โค4
Roadmap to learn Network Engineering
Here's a comprehensive guide to mastering the essential skills and knowledge areas:
1. Networking Fundamentals: OSI model, TCP/IP model, and networking devices (routers, switches, hubs, bridges).
2. Network Protocols: Core protocols (TCP, UDP, IP), application layer protocols (HTTP, HTTPS, FTP, DNS, DHCP), and additional protocols (SNMP, ICMP, ARP).
3. Routing and Switching: Routing protocols (OSPF, EIGRP, BGP), switching concepts (VLANs, STP, trunking), and routing techniques.
4. Network Design and Architecture: Network topologies (star, mesh, bus, ring), design principles (redundancy, scalability, reliability), and network types (LAN,
WAN, MAN, WLAN, VLAN).
5. Network Security: Firewalls, VPNs, ACLs, security protocols (SSL/TLS, IPSec), and best practices.
6. Wireless Networking: Wireless standards (IEEE 802.11a/b/g/n/ac/ax), wireless security (WPA2, WPA3), and network design.
7. Cloud Networking: Cloud services (VPC, Direct Connect, VPN), hybrid cloud Networking, and cloud providers (AWS, Azure, Google Cloud).
8. Network Automation and Scripting: Network programmability, automation techniques, and scripting (Python, Bash, PowerShell).
9. Monitoring and Troubleshooting: Network monitoring, troubleshooting techniques (ping, traceroute, network diagrams), and performance monitoring (NetFlow, SNMP).
10. Virtualization and Container Networking: Virtual network functions (NFV), software-defined networking (SDN), and container networking (Docker, Kubernetes).
11. Certifications: Entry-level (CompTIA Network+, Cisco CCNA), professional-level (Cisco CCNP, Juniper JNCIP), advanced-level (Cisco CCIE, VMware VCP-NV).
Here's a comprehensive guide to mastering the essential skills and knowledge areas:
1. Networking Fundamentals: OSI model, TCP/IP model, and networking devices (routers, switches, hubs, bridges).
2. Network Protocols: Core protocols (TCP, UDP, IP), application layer protocols (HTTP, HTTPS, FTP, DNS, DHCP), and additional protocols (SNMP, ICMP, ARP).
3. Routing and Switching: Routing protocols (OSPF, EIGRP, BGP), switching concepts (VLANs, STP, trunking), and routing techniques.
4. Network Design and Architecture: Network topologies (star, mesh, bus, ring), design principles (redundancy, scalability, reliability), and network types (LAN,
WAN, MAN, WLAN, VLAN).
5. Network Security: Firewalls, VPNs, ACLs, security protocols (SSL/TLS, IPSec), and best practices.
6. Wireless Networking: Wireless standards (IEEE 802.11a/b/g/n/ac/ax), wireless security (WPA2, WPA3), and network design.
7. Cloud Networking: Cloud services (VPC, Direct Connect, VPN), hybrid cloud Networking, and cloud providers (AWS, Azure, Google Cloud).
8. Network Automation and Scripting: Network programmability, automation techniques, and scripting (Python, Bash, PowerShell).
9. Monitoring and Troubleshooting: Network monitoring, troubleshooting techniques (ping, traceroute, network diagrams), and performance monitoring (NetFlow, SNMP).
10. Virtualization and Container Networking: Virtual network functions (NFV), software-defined networking (SDN), and container networking (Docker, Kubernetes).
11. Certifications: Entry-level (CompTIA Network+, Cisco CCNA), professional-level (Cisco CCNP, Juniper JNCIP), advanced-level (Cisco CCIE, VMware VCP-NV).
โค5๐ฅ1
๐ Web Development Essentials (2025 Edition) ๐
Master the tools & skills that power the modern internet!
๐จ Frontend Development (Client-Side)
๐ What users see & interact with.
HTML: Page structure
CSS: Styling & animations
JavaScript: Interactivity
Frameworks: React, Vue, Angular
Responsive Design: Mobile-friendly layouts
โ๏ธ Backend Development (Server-Side)
๐ Handles data, logic, and authentication.
Languages: Node.js, Python, PHP, Ruby
Databases: MySQL, PostgreSQL, MongoDB
APIs: REST, GraphQL
Auth: JWT, OAuth2, Sessions
๐ Full-Stack Development
๐ Both frontend + backend skills.
Popular Stacks:
MERN (MongoDB, Express, React, Node.js)
MEAN (MongoDB, Express, Angular, Node.js)
LAMP (Linux, Apache, MySQL, PHP)
โก Key Tools & Concepts
โ Git & GitHub โ Version control & collaboration
โ Performance Optimization โ Lazy loading, caching, CDNs
โ Deployment โ Netlify, Vercel, Heroku, AWS
โ Security โ Prevent SQLi, XSS, CSRF
โ SEO โ Optimize meta tags, page speed, accessibility
๐ฅ React โค๏ธ for more ๐๐ป
Master the tools & skills that power the modern internet!
๐จ Frontend Development (Client-Side)
๐ What users see & interact with.
HTML: Page structure
CSS: Styling & animations
JavaScript: Interactivity
Frameworks: React, Vue, Angular
Responsive Design: Mobile-friendly layouts
โ๏ธ Backend Development (Server-Side)
๐ Handles data, logic, and authentication.
Languages: Node.js, Python, PHP, Ruby
Databases: MySQL, PostgreSQL, MongoDB
APIs: REST, GraphQL
Auth: JWT, OAuth2, Sessions
๐ Full-Stack Development
๐ Both frontend + backend skills.
Popular Stacks:
MERN (MongoDB, Express, React, Node.js)
MEAN (MongoDB, Express, Angular, Node.js)
LAMP (Linux, Apache, MySQL, PHP)
โก Key Tools & Concepts
โ Git & GitHub โ Version control & collaboration
โ Performance Optimization โ Lazy loading, caching, CDNs
โ Deployment โ Netlify, Vercel, Heroku, AWS
โ Security โ Prevent SQLi, XSS, CSRF
โ SEO โ Optimize meta tags, page speed, accessibility
๐ฅ React โค๏ธ for more ๐๐ป
โค13๐2๐ฅ1๐1
Website Development Roadmap โ 2025
๐น Stage 1: HTML โ Learn the basics of web page structure.
๐น Stage 2: CSS โ Style and enhance web pages (Flexbox, Grid, Animations).
๐น Stage 3: JavaScript (ES6+) โ Add interactivity and dynamic features.
๐น Stage 4: Git & GitHub โ Manage code versions and collaborate.
๐น Stage 5: Responsive Design โ Make websites mobile-friendly (Media Queries, Bootstrap, Tailwind CSS).
๐น Stage 6: UI/UX Basics โ Understand user experience and design principles.
๐น Stage 7: JavaScript Frameworks โ Learn React.js, Vue.js, or Angular for interactive UIs.
๐น Stage 8: Backend Development โ Use Node.js, PHP, Python, or Ruby to
build server-side logic.
๐น Stage 9: Databases โ Work with MySQL, PostgreSQL, or MongoDB for data storage.
๐น Stage 10: RESTful APIs & GraphQL โ Create APIs for data communication.
๐น Stage 11: Authentication & Security โ Implement JWT, OAuth, and HTTPS best practices.
๐น Stage 12: Full Stack Project โ Build a fully functional website with both frontend and backend.
๐น Stage 13: Testing & Debugging โ Use Jest, Cypress, or other testing tools.
๐น Stage 14: Deployment โ Host websites using Netlify, Vercel, or cloud services.
๐น Stage 15: Performance Optimization โ Improve website speed (Lazy Click Me Load More, CDN, Caching).
๐ Web Development Resources
ENJOY LEARNING ๐๐
๐น Stage 1: HTML โ Learn the basics of web page structure.
๐น Stage 2: CSS โ Style and enhance web pages (Flexbox, Grid, Animations).
๐น Stage 3: JavaScript (ES6+) โ Add interactivity and dynamic features.
๐น Stage 4: Git & GitHub โ Manage code versions and collaborate.
๐น Stage 5: Responsive Design โ Make websites mobile-friendly (Media Queries, Bootstrap, Tailwind CSS).
๐น Stage 6: UI/UX Basics โ Understand user experience and design principles.
๐น Stage 7: JavaScript Frameworks โ Learn React.js, Vue.js, or Angular for interactive UIs.
๐น Stage 8: Backend Development โ Use Node.js, PHP, Python, or Ruby to
build server-side logic.
๐น Stage 9: Databases โ Work with MySQL, PostgreSQL, or MongoDB for data storage.
๐น Stage 10: RESTful APIs & GraphQL โ Create APIs for data communication.
๐น Stage 11: Authentication & Security โ Implement JWT, OAuth, and HTTPS best practices.
๐น Stage 12: Full Stack Project โ Build a fully functional website with both frontend and backend.
๐น Stage 13: Testing & Debugging โ Use Jest, Cypress, or other testing tools.
๐น Stage 14: Deployment โ Host websites using Netlify, Vercel, or cloud services.
๐น Stage 15: Performance Optimization โ Improve website speed (Lazy Click Me Load More, CDN, Caching).
๐ Web Development Resources
ENJOY LEARNING ๐๐
โค10๐ฅ2
Web Development Interview Questions for Freshers
1. What happens when you type a URL in your browser and press Enter?
Answer:
DNS lookup happens to find the IP address
Browser sends an HTTP/HTTPS request to the server
Server processes and sends back HTML/CSS/JS
Browser renders the page using its rendering engine
2. What is the difference between GET and POST requests?
Answer:
GET: Sends data in the URL, used for fetching data
POST: Sends data in the body, used for submitting data securely
3. What is a responsive website?
Answer:
A responsive website adjusts layout and design based on screen size and device (mobile, tablet, desktop), usually using CSS media queries.
4. What is the role of Webpack in web development?
Answer:
Webpack bundles JavaScript files, CSS, and assets into optimized output for faster website loading and better performance.
5. What is the purpose of async and defer in script tags?
Answer:
async: Loads script asynchronously and executes it immediately
defer: Loads script asynchronously but executes after HTML is parsed
6. What is the difference between localStorage and sessionStorage?
Answer:
localStorage: Stores data with no expiration
sessionStorage: Stores data until the browser tab is closed
7. What is CORS?
Answer:
CORS (Cross-Origin Resource Sharing) is a browser security feature that restricts cross-domain API calls unless the server allows it.
8. What is the difference between null and undefined in JavaScript?
Answer:
undefined: A variable declared but not assigned a value
null: A variable explicitly set to have no value
9. How do you optimize website performance?
Answer:
Minify CSS/JS
Compress images
Use lazy loading
Use caching
Reduce HTTP requests
Use a CDN
10. What is the DOM?
Answer:
DOM (Document Object Model) represents the structure of an HTML document as objects, which JavaScript can interact with to change content dynamically.
Credits: https://whatsapp.com/channel/0029VaiSdWu4NVis9yNEE72z/847
1. What happens when you type a URL in your browser and press Enter?
Answer:
DNS lookup happens to find the IP address
Browser sends an HTTP/HTTPS request to the server
Server processes and sends back HTML/CSS/JS
Browser renders the page using its rendering engine
2. What is the difference between GET and POST requests?
Answer:
GET: Sends data in the URL, used for fetching data
POST: Sends data in the body, used for submitting data securely
3. What is a responsive website?
Answer:
A responsive website adjusts layout and design based on screen size and device (mobile, tablet, desktop), usually using CSS media queries.
4. What is the role of Webpack in web development?
Answer:
Webpack bundles JavaScript files, CSS, and assets into optimized output for faster website loading and better performance.
5. What is the purpose of async and defer in script tags?
Answer:
async: Loads script asynchronously and executes it immediately
defer: Loads script asynchronously but executes after HTML is parsed
6. What is the difference between localStorage and sessionStorage?
Answer:
localStorage: Stores data with no expiration
sessionStorage: Stores data until the browser tab is closed
7. What is CORS?
Answer:
CORS (Cross-Origin Resource Sharing) is a browser security feature that restricts cross-domain API calls unless the server allows it.
8. What is the difference between null and undefined in JavaScript?
Answer:
undefined: A variable declared but not assigned a value
null: A variable explicitly set to have no value
9. How do you optimize website performance?
Answer:
Minify CSS/JS
Compress images
Use lazy loading
Use caching
Reduce HTTP requests
Use a CDN
10. What is the DOM?
Answer:
DOM (Document Object Model) represents the structure of an HTML document as objects, which JavaScript can interact with to change content dynamically.
Credits: https://whatsapp.com/channel/0029VaiSdWu4NVis9yNEE72z/847
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Web Development Interview Questions Part-2
11. What are semantic HTML elements?
Answer:
Semantic elements clearly describe their meaning in a human- and machine-readable way. Examples: <header>, <footer>, <article>, <nav>.
12. What are HTTP status codes?
Answer:
They indicate the result of an HTTP request.
Common ones:
200 OK (Success)
404 Not Found
500 Internal Server Error
401 Unauthorized
403 Forbidden
13. What is the box model in CSS?
Answer:
The box model includes:
Content
Padding
Border
Margin
It defines how space is taken up around HTML elements.
14. What are pseudo-classes in CSS?
Answer:
Pseudo-classes style elements based on their state.
Examples:
:hover (when mouse is over)
:first-child
:nth-child()
15. How do you make a website SEO-friendly?
Answer:
Use semantic HTML
Add meta tags and alt text
Mobile responsiveness
Fast loading speed
Proper URL structure
16. What is the difference between synchronous and asynchronous in JavaScript?
Answer:
Synchronous: Code runs line by line
Asynchronous: Tasks like API calls don't block other code; use callbacks, promises, or async/await
17. What is a promise in JavaScript?
Answer:
A Promise represents the result of an async operation.
It can be:
Pending
Fulfilled
Rejected
18. What is event bubbling and capturing in JavaScript?
Answer:
Bubbling: Event propagates from child to parent
Capturing: Event goes from parent to child
You can control it using event.stopPropagation()
19. What is a CDN?
Answer:
CDN (Content Delivery Network) delivers static files (images, CSS, JS) via servers closest to the user to improve website speed.
20. What tools do you use for version control?
Answer:
Most common: Git + GitHub
Git tracks changes in code, and GitHub helps you collaborate and manage versions.
11. What are semantic HTML elements?
Answer:
Semantic elements clearly describe their meaning in a human- and machine-readable way. Examples: <header>, <footer>, <article>, <nav>.
12. What are HTTP status codes?
Answer:
They indicate the result of an HTTP request.
Common ones:
200 OK (Success)
404 Not Found
500 Internal Server Error
401 Unauthorized
403 Forbidden
13. What is the box model in CSS?
Answer:
The box model includes:
Content
Padding
Border
Margin
It defines how space is taken up around HTML elements.
14. What are pseudo-classes in CSS?
Answer:
Pseudo-classes style elements based on their state.
Examples:
:hover (when mouse is over)
:first-child
:nth-child()
15. How do you make a website SEO-friendly?
Answer:
Use semantic HTML
Add meta tags and alt text
Mobile responsiveness
Fast loading speed
Proper URL structure
16. What is the difference between synchronous and asynchronous in JavaScript?
Answer:
Synchronous: Code runs line by line
Asynchronous: Tasks like API calls don't block other code; use callbacks, promises, or async/await
17. What is a promise in JavaScript?
Answer:
A Promise represents the result of an async operation.
It can be:
Pending
Fulfilled
Rejected
18. What is event bubbling and capturing in JavaScript?
Answer:
Bubbling: Event propagates from child to parent
Capturing: Event goes from parent to child
You can control it using event.stopPropagation()
19. What is a CDN?
Answer:
CDN (Content Delivery Network) delivers static files (images, CSS, JS) via servers closest to the user to improve website speed.
20. What tools do you use for version control?
Answer:
Most common: Git + GitHub
Git tracks changes in code, and GitHub helps you collaborate and manage versions.
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