JavaScript Interview Questions & Answers | JavaScript Interview Questions

Learn JavaScript Interview Question & Answers with real-time examples -

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00:00 Introduction
2:50 Question 1:- Why do we call JavaScript as dynamic language?
3:54 Question 2:- how does JavaScript determine data types ?
4:44 Question 3:- What is typeof functions?
4:44 Question 4:- How to check data type in JavaScript ?
5:21 Question 5:- What are different datatypes in JavaScript ?
7:51 Question 6:- Explain Undefined Data types ?
8:36 Question 7:- What is Null ?
9:02 Question 8:- Differentiate between Null and Undefined ?
9:41 Question 9:- Explain Hoisting ?
10:51 Question 10:- Are JavaScript initialization hoisted ?
11:39 Question 11:- What are global variables ?
12:06 Question 12:- What are the issues with Global variables ?
12:30 Question 13:- What happens when you declare variable with out VAR ?
13:30 Question 14:- What is Use Strict ?
13:30 Question 15:- How to force developers to use Var keyword ?
14:26 Question 16:- How can we handle Global Variables ?
14:26 Question 17:- How can we avoid Global variables ?
16:14 Question 18:- What are Closures ?
19:16 Question 19:- Why do we need Closures ?
22:52 Question 20:- Explain IIFE ?
24:40 Question 21:- What is the use of IIFE ?
24:40 Question 22:- What is name collision in global scope ?
24:40 Question 23:- IIFE vs Normal Function?
28:12 Question 24:- What are design patterns ?
28:52 Question 25:- Which is the most used design pattern?
29:03 Question 26:- What is module Pattern and revealing module pattern ?
33:57 Question 27:- What are the various ways to create JavaScript objects?
35:55 Question 28:- How can we do inheritance in JavaScript ?
35:55 Question 29:- What is prototype in JavaScript ?
35:55 Question 30:- Explain Prototype chaining ?
43:41 Question 31:- What is Let Keyword?
45:52 Question 32:- Are Let variables hoisted ?
48:27 Question 33:- Explain Temporal Dead Zone ?
51:28 Question 34:- Let vs Var
58:12 Question 35:- String Concatenation and Arithmetic puzzle
Question 36 :- What is class in ES6 ?
Question 37 :- So with class Keyword does it imply JavaScript is a OOP language ?
Question 38 :- Differentiate between class and normal function ?
Question 39 :- What is a Arrow function ?
Question 40 :- Why do we use Arrow function ?
Question 41 :- Differentiate between Arrow vs Normal Function ?
Question 42 :- Does Arrow function create its own this ?
Question 43. Explain Synchronous execution ?
Question 44. What is a call Stack ?
Question 45. What is a blocking call ?
Question 46. How to avoid blocking calls ?
Question 47. Explain Asynchronous execution ?
Question 48. Synch vs Asynch ?
Question 49. How can we do Asynch calls ?
Question 50. What is a thread ?
Question 51. Explain Multi-threading ?
Question 52. Is JavaScript Multi-threaded ?
Question 53. Then how does Settimeout run ?
Question 54. What is a WebAPI/Browser API ?
Question 55. What is a Event loop and callback queue?
Question 56. Eventloop and Callback code question

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[keerthanaanandan]

One more thing I would like to add

1+1+”4” gives 24
“4”+1+1 gives 411
Js works from left to right and if the starting is string then it takes upcoming values as string as well

[ganapathilana]

Thanks for detailed Q& A.
Good clarity in list :
1. dynamic language.
2. Hositing behavior,
3. global variable,
4. use strict,
5. closure,
6.IIFE
7. design patterns
8.create object -
9. Inheritance - prototypal inheritance.
10. let keyword - temporal dead zone.
11. let vs var

[on.alin]

I LOVE THAT U REPEAT THE ANSWERS 2-3-4 TIMES. IT REALLY HELP ME TO UNDERSTAND !!!
THANKS YOU !!!

[raxitlakhatariya]

I am grateful to find this channel. Thank you for such an awesome explanation.

[nethajimurthy]

If you were my mentor, i will have the potential to get into any company as i prefer.... God level details... Now my confidence level is 100% thank you so much... And that closure concept is mind blower

[PallaviDwivedi-xpgy]

This video is Gold for interview prep. It gives you clarity on the concepts so that you don't just blabber things during the interview.

[udayaswal]

Thanks a lot. ❤️
. waiting for part 2

Shared this on all the major platforms

[syedbabarali]

Thank you sir shiv, you make the material with great effort.

[MILINDNEWTON]

Hi Sir, your questions helps in cracking interviews. Thanks very much!

[tonybaker]

i love your courses - very concise and pretty broad ranging

[tanujafirake]

very amazing explanation given by sir. it is very helpful for me, Thank you

[lishna]

Thank you sir.. good explanation with examples.

[abhishekkarsh]

Wow you have just amazing Technic to explain tough concepts a big thank you

[mayurrathor]

Most await for part-2 Advance JS interview questions

[Shri_Hegde]

Thank you for this video. Please make video of React js interview questions

[amitvyas]

good explanation sir, Its very helpful.

[ankitgiri]

Thanks a lot sir for great value addition, all are amazing videos.

[vivekmodi]

Nice explanation.
You have explained all core concepts very well that takes JS knowledge into next level.
You have explained that why those concepts are used and which problems are resolved by them, which is very good.

[priyaistalingam]

Videos... Quest with explanation was very nice... Thank u sir

[mahavirsinghrajpurohit]

You are awesome 😎 Kindly make more videos. This is really helpful 🙏