I must know them BEFORE INTERVIEW

Know these in and out

For a FRONT-END ENGINEER position

1. What is JavaScript

2. JS compile scenario

3. Datatypes of JS

4. What is the difference between querySelectorAll and getElementsByClassName (or getElementsByTagName)? https://chat.openai.com/share/bfc44d15-f3cb-45e4-b9ca-2216d79d52c0

5. Debouncing and Throttling - Implementation of both, examples of each

6. Promises

7. Cookies, Local Storage, Session storage

8. Async Await

9. Var, Let, and Const

10. Iterator and Iterable

11. Generator

12. Call, Bind, and Apply

13. Closures - Advantages, Disadvantages, with an example implementation

14. Map vs Set for problem-solving

15. Array and Object iteration method problem-solving

16. Js Working behind the scenes

17. Event loop

18. Function types

19. Ways to create an object

20. Prototypal inheritance

21. this keyword

22. == vs ===

23. Type coercion

24. Hoisting

25. nan vs undefined vs not-defined

26. Pass by value vs reference

27. Currying - Methods of creating currying

28. DOM

29. TDZ

30. Map, Reduce, and Filter

Must watch videos

Top 5 JS interview questions

Tricky JS interview questions

Javascript coding challenges practice

My JS notes, and CSS

• For JS theory, study the JS notes on gitbook, and for promises, study my handwritten notes or refer to code with harry videos quickly

• For CSS, study W3 schools and know these concepts

  • How to select CSS children

  • If green div is inside blue div, if blue div is hovered then green div should disappear

  • If green div is hovered, blue div can't disappear as it is the parent so you need JS. See how to do it in JS

  • For these things you need to study CSS Selectors - https://www.w3schools.com/css/css_selectors.asp

Accordion

• Do the accordion app in Plain HTML, JS and also do this in react

• That way, it is a good practice of JS and React before you go to interview

Application Form

• Do a small HTML, JS app where you have 3 inputs, username, email and phone. If they are empty then you should show an error message that is already written in HTML (just apply css class in js to show the error). Once the form is good, submit it so that it should be added to an array (window object maybe) and could be shown on the screen.

• Do the same in react

Image slider

• Do an image slider in JS

• Do it in react as well

For a BACKEND ENGINEER position

You should practice these before you go to interview

SQL

• Practice SQL from https://www.sql-practice.com/. There are around 42 questions here including Easy, Medium and Hard.
• Solve Leetcode top 50 questions of SQL, https://leetcode.com/studyplan/top-sql-50/

DSA

• Practice DSA from my notion notes