Top Tricky JavaScript Interview Questions and Answers

Cracking JavaScript coding Interview by learning difficult JavaScript interview Questions. commonly Asked JavaScript Interview Questions.

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Help me translate this video.

[anandparmar]

The one you mentioned for sorting is not working. Instead of returning a<b or a>b it should be a-b or b-a in the call back function. Thank you for this video :)

[mendelson-dev]

it is worth mentioning that when we use "use strict" it will throw the error (example with IIFE)

[karimullashaik]

Thank you so much for making the videos and helping the web developers careers.
For some reason, the sorting of integers with callback didn't work with a<b, b<a, instead works with a-b, b-a.
console.log(arr.sort((a, b) =>
{
return b-a;
}));

[DevDoodle]

These are JS interview questions straight out of hell 🔥 😂
Thank you so much for your super insightful and quick videos! I love them

[inspektorkludge]

For the sorting one, the comparison is not working because the function looks for a number value, not a boolean :(

x.sort((a, b) => (a-b)) works though!

Thanks for this though and I love your videos

[HearItFirst]

If an interviewer asks you these questions, just leave the interview because there are tonnes of things to ask about code management, design patterns and consideration of scalability.

[shubhamarora]

Your videos are great. They are short but covers a lot. Keep doing the great work 👍🏻

[frontend-coder]

NaN compared to anything is always false, even comparing to itself!

[owenwood]

Just a note as a mathematician - 0/0 is undefined mathematically, rather than infinite (think: anything multiplied by 0 is 0, but anything divided by 0 is infinite, so 0/0 doesn't have any value). When we have i = MIN_VALUE, i*i is 0 because i*i is less than i, so js makes it zero (as appears to be the definition of MIN_VALUE). And then i/i is 1 not because i is small, but just because anything divided by itself is one (except 0/0).

[iponik]

I am too late with homework, but NaN === NaN is false because NaN is typeof Number which is an object (not primitive). When you compare objects in JavaScript, you are determining if 2 objects are the same instance of specified object type.
So you are comparing 2 different instances of Number object.
For example undefined === undefined is true, because undefined is primitive type (you are just comparing values).

And seems like my answer is wrong 😅

[SonuKumar-gnhm]

The one you mentioned for sorting is not working. Instead of returning a<b or a>b it should be a-b or b-a in the call back function.

[osamatalaat]

Thank you so much
We wanna a separate Playlist to all of the Tricky Javascript interview questions videos

[deepakgour]

I never seen this type of questions.
How do you find such a type of questions like this? This is awesome.🙂👍🏻

[SameerUnt]

2:31 index doesn’t mean to find the value. Its like find me the location of that value.

[carefree_ladka]

When you said 0/0 is infinite, it's not true. It's always NaN in JavaScript. And it's not infinite in Mathematics either. Your videos are great source of learning. Thank you for making time and making these ones 🙂.

[devolee]

I really enjoy these series. Thanks you sir!

[kamal-ahmed]

Nice video. Thanks for your hard work and time.

[dantegreyson]

Thanks for the Q&A!! Really love the videos. For the problem [1, 2, 3] + [4, 5, 6] how come the "[" and "]" were ignored but not the commas ", " during concatenation?

[Harshavardhan-gdeu]

Great Video as always :) Thanks for making JavaScript so easier to learn :) .

[naveenreddydepa]

I feel much fun, enthusiastic while attempting these interview questions.Awesome stuff