JavaScript Interview Questions and Answers | Top 70 JavaScript Interview Questions | Great Learning

JavaScript Interview Questions and Answers | Top 70 JavaScript Interview Questions | Great Learning
JavaScript is one of the most popular scripting languages with frameworks and libraries like react, and angular its popularity has grown. JavaScript is one of the most common scripting languages required for a software developer. Keeping this popularity in mind, Great learning has come up with this tutorial on JavaScript interview questions and answers.

Some of the important JavaScript interview questions covered in this video:
1. What is JavaScript?
2. How Many ways are there to write JavaScript Code?
3. How Many Ways are there to open Console?
4. How can you write JavaScript code directly in HTML File?
5. What is the correct syntax for referring to an internal script?
7. What will be the output of the following JavaScript Codes?
var name = “james”;
var roll_no = 30;
8. What will be the output of the following?
9. Which of the following is a JavaScript datatype?
10. What is the basic use of the NaN function in JavaScript?
11. What should be the answer of 3+2+”7”?
12. What is the use of delete operator?
13. What do you mean by escape characters?
14. What is IIFE?
15. What is an object in JavaScript, and How to create one?
16. What is Encapsulation?
17. What is a Constructor?
18. What is polymorphism?
19. What is Method Overloading?
20. What is Method Overriding?

Great Learning brings you this tutorial on "JavaScript Interview Questions". In this tutorial, we will take you through some of the important and frequently asked JavaScript interview questions that will help you in the near future. These questions will include the core as well as advanced topics in JavaScript. Also, we will be covering coding and output-based questions with detailed explanations and we will be covering topics like Data Types, Properties, Arrays, Functions, OOPs, etc.

Time Stamps for the interview questions covered:
0:00:00 Introduction
0:09:24 Basics of JavaScript
0:21:26 Question on DataTypes & Properties
0:31:52 Question on Arrays
0:41:44 Question on Operators
1:05:11 Question on Functions
1:19:10 Question on OOPs
1:34:27 Question on Error Handling

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[perspectiva-psicologica]

On question 10 at 15:26 the right answer is number 3. Yes, functions hoist completely but because you are assigning the function to a variable var will hoist with a value of undefined.

[arunkumarnenga]

Such a contentfull video i never seen like this really so much helpful keep doing more🙏💐

[varunrithvikgudluru]

Please make this..on PYTHON 🙏🏻🙏🏻🙏🏻...
VERY VERY USEFUL

[raghavjha]

I liked your video, a lot. Thanks for such important video. Very helpful to understand the deep concept.

[shahhussain]

Thanks a lot sir all question are very cleared now. If you can make similar videos for React Js that will be very helpful for us Sir

[girishpandey]

Thanks sir for providing us such wonderful contents that we never ever got from any source..

[surjendudas]

pls, upload more and more videos like this. This is my humble request

[ritavdas]

1:32:48 . For method overriding, the parameters should be same (not the arguments)

[davven]

Question 10 has wrong answer, It will give error (variablename) is not a function, cuz variables declared with var gets hoisted and its value is undefined so when you try to call undefined you'll get an error, cuz we all know undefined is'nt a function.

[wolvepooline]

Great video. Learnt a lot. Thank you!

[sampathb]

question number 10 is wrong bro its a function expression it will not hoisted so we are calling before function expression so will give error that variable not a function

[zaheersheikh]

Answer 11 should be 2, Choice1 Undefined Choice2 Orange

[Raosandeep]

in question 10 answer should be 3.Error