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JavaScript Interview Questions & Answers

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From basic to advanced: Test how well you know JavaScript, refresh your knowledge a bit, or prepare for your coding interview. I update this repo regularly with new questions.
A complete JavaScript interview handbook/series containing all the topics from basic level to advance. This Series consists of 45+ important topics with related questions and answers.

Topics covered in the series

No.	Topic
1	Introduction to Javascript
2	Advantages of JS
3	Disadvantages of JS
4	Client and Server Javascript
5	Strict mode in JS
6	DOM and BOM
7	Window and Document Object
8	JS Engine
9	Code Execution in JS
10	Event Loop
11	Data Types
12	Operators
13	Coercion and Type conversion
14	Types of Errors
15	Scope
16	Shadowing
17	Hoisting
18	VAR vs LET vs CONST
19	Functions
20	Parameters vs Arguments
21	Spread vs Rest Operator
22	Higher order functions
23	IIFE
24	Closure
25	Currying
26	Infinite Currying
27	Callbacks
28	This Keyword
29	Objects
30	Delete Keyword
31	Constructor Function
32	Getter Setter
33	Prototype
34	Prototype Chaining
35	Classes
36	Inheritance
37	Static Keyword
38	Private Methods
39	OOPS
41	Encapsulation
42	Abstraction
43	Polymorphism
44	Polyfills
45	Deep copy and shallow copy
46	Promises
47	Async Await
48	Event Propagation
49	SetTimeout and SetInterval
50	SetTimeout and SetInterval
51	Cookies and Local storage
52	Debouncing
53	Throttling
54	Set , Map , weakSet , weakMap
55	Debugger
56	Debugger
57	Important output based questions
58	Important theory questions

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Disclaimer | Note :

The topics and questions provided in this repository are the summary of all the frequently asked questions across numerous companies. We cannot guarantee that these questions will actually be asked during your interview process, nor should you focus on memorizing all of them.

Good luck with your interview 😊

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