Interview questions for JS

Javascipt is a great language and i believe every web developer in todays world should definitely learn it.

Not is it just awesome but also by just learning and understanding javascript you will be able to learn and use so many great frameworks that are buzzing in current job market
like React , Angular , Next JS etc.

So this is a gist of some of the questions and concepts that i have came across in my interview for some product based startups.

Basics

Basics of javascript should be clear very much , Things like arrays , objects , variables etc should be very clear before even you think of applying at any job as a js dev.

Arrays

Arrays are very important and since you will be using them so much in your day to day use case as being a web dev you should definitely learn all the things that can be done in js for arrays like
* Push
* pop
* shift
* unshift
also you should learn how we iterate over arrays

Also learn these :-
* Slice
* Splice

Objects

Every developer in his day to day life will definitely come across objects while working on a javascript project .
So every interviewer expects you know the basics of Objects.

Try to understand them and apply them in any of your projects.

Objects will also be used while you work on things like json all that is is a big blob of object so you have to work with them .

So try to understand all related topics to objects
Things like how we add an item to an object

How to iterate through an object
How can we delete an item from an object

Try to also learn things like object.keys , object.freeze etc.

More Good Topics

Every interviewer will ask you questions related to these questions so its very necessary that you know these concepts and can explain them in detail

Whats Execution context in js.
Whats a promise and how to create one .
What are callbacks
whats async/await used for
Difference between == and ===
whats call , apply and bind .
Difference between simple functions and arrow functions
Whats 'this' in javascript
What are closures
whats memoization
what is an IIFE(Immediately Invoked Function Expression).
Difference between let and Var.
Different stages of a promise.
Difference between setTimeout and setInterval

There are other topics also which you should give a good go before going for the interview , not everyone will ask you these but its good to know them

Whats prototype and prototypal inheritance
what are anonymous functions
Event bubbling and how do you prevent that.
Whats promise.all
whats a polyfill.

There are many many topics in javascript that you would to know but for a fresher js or even for 1+ year of experience these are the most asked questions .
You can also checkout the greats series by Akshay Saini which explains all the javascript concepts in great detail.

All right , i guess this will be hopefully helpful for any one out there .

Feel free to reach out to me for any thing over email
junaid shah