JavaScript Interview Questions and Answers
Q&A Videos with PDF & Source Codes
What you'll learn :-
Javascript is a popular web development language. At first, it was intended to create dynamic web pages.This JavaScript Interview Questions and Answers (PDFincluded ) will provide you with in-depth knowledge and will assist you in preparing for your interviews.
Course Content
- Question 1 :- Why do we call JavaScript as dynamic language
- Question 2 :- how does JavaScript determine data types ?
- Question 3 :- What is typeof ?
- Question 4 :- How to check data type in JavaScript ?
- Question 5 :- What are different datatypes in JavaScript ?
- Question 6 :- Explain Undefined Data types ?
- Question 7 :- What is Null ?
- Question 8 :- Differentiate between Null and Undefined ?
- Question 9 :- Explain Hoisting ?
- Question 10 :- Are JavaScript initialization hoisted ?
- Question 11 :- What are global variables ?
- Question 12 :- What are the issues with Global variables ?
- Question 13 :- What happens when you declare variable with out VAR ?
- Question 14 :- What is Use Strict ?
- Question 15 :- How to force developers to use Var keyword ?
- Question 16 :- How can we handle Global Variables ?
- Question 17 :- How can we avoid Global variables ?
- Question 18 :- What are Closures ?
- Question 19 :- Why do we need Closures ?
- Question 20 :- Explain IIFE ?
- Question 21 :- What is the use of IIFE ?
- Question 22 :- What is name collision in global scope ?
- Question 23 :- IIFE vs Normal Function
- Question 24 :- What are design patterns ?
- Question 25 :- Which is the most used design pattern
- Question 26 :- What is module Pattern and revealing module pattern ?
- Question 27 :- How man ways are there to create JavaScript objects ?
- Question 28 :- How can we do inheritance in JavaScript ?
- Question 29 :- What is prototype in JavaScript ?
- Question 30 :-Explain Prototype chaining ?
- Question 31 :- What is Let Keyword ?
- Question 32 :- Are Let variables hoisted ?
- Question 33 :- Explain Temporal Dead Zone ?
- Question 34 :- Let vs Var
- 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
- Question 57. What are promises in JavaScript?
- Question 58. How to catch error in promises ?
- Question 59. What are callbacks ?
- Question 60. Explain Promise chaining ?
- Question 61. Three States of Promises ?
- Question 62. Explain Async and Await ?
- Question 63. Why to make a promise synch?
- Question 64. Does Async represent a promise ?
- Question 65. Can we use Async with out Await ?
- Question 66. What are Micro and Macro queues ?
- Question 67. Who executes first Micro or Macro ?
- Question 68. How will the code execute(testing Micro and Macro)?
- Question 69. Can we schedule a MicroTask Manually ?
- Question 70. Are Micro and Macro Task synch or Async ?
- Question 71. Explain Webworker ?
- Question 72. How to create WebWorker ?
- Question 73. What are postmessage and onmessage in webworker ?
- Question 74. Can Webworker update UI ?
- Question 75. WebWorker vs Async Task
- Question 76. WebWorker vs Promises
- Question 77. Asynch vs Threads
- Question 78. Concurrency vs Parallelism
- JavaScript interview questions with answers PDF.
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