JavaScript Interview Questions & Answers | JavaScript Interview Questions

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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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