Frontend Interview Question | How to Flatten Array of Array ? | Recursion| Javascript Interview

Hi Everyone
Flatten Array of Array is one of the most asked Interview Question and this is very important to understand to solve many complex problems in programming.
This video will cover all about how to Flatten your array of array and how Recursion will help you to solve this use case.
Watch the complete video till the end to understand it completely.
What is Recursion?
Recursion is defined as the process of a function calling itself. A recursive function is the function that corresponds to this.
The base case (or halting condition) and the recursive call to itself are commonly two elements of a recursive function.
The base case is when the function should no longer recurse.'
A recursive call is when a function calls itself, usually with slightly modified arguments that 'work down' to the base case.
Check video on Recursion
• What is Recursion | Ja...
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[@MrCoder-u9y]

Surely your teachers must be proud of you, best explained!

[@pinakapani8250]

I am really addicted to your videos after watching your redux toolkit in 1 hour Project and now I am exploring all of your videos and every video is a diamond. Thank you for your excellent explanation & hoping to learn a lot from you mam.

[@ajithkumarb8216]

Clearly explained. Thank you... expecting more interview questions from u

[@NishaSingla]

Thank you :)

[@explore-learn-share6937]

Very well explained ✓ Concept of flate Ning array is clear to me now 🙏

[@NishaSingla]

Thank you :)

[@shantanushukla1178]

Thank You so much ma'am, you are really very good teacher.

[@mehakjain5384]

Thank you for explaining so effortlessly ☺️ good wishes to you ❤️

[@NishaSingla]

Thank you so much 🎉🥰🥰

[@BrijeshSingh-dp1ku]

Thanks for sharing keep making such tutorials 👍

[@NishaSingla]

Thank you :)

[@srinivasamg2739]

Nice explanation

[@NishaSingla]

Thank you :)

[@vaibhavsarode6637]

Osm and perfect explanation, thank you for the video

[@NishaSingla]

Thank you :)

[@softwarejobkosam7327]

Very helpful do more interview and in depth concept videos s

[@NishaSingla]

Thank you :)

[@rosonerri-faithful]

Thanks Mam for the explanation.😃

[@NishaSingla]

Thank you :)

[@shivugg]

Wow madam you have repository of knowledge

[@ashishnayak2666]

Nice explanation....waiting for ur react series

[@NishaSingla]

Thank you :)

[@malayaprasadlenka9088]

Nice explained 👍

[@NishaSingla]

Thank you :)

[@ishaikhmd]

Excellent

[@anandagar2k]

should create the output variable inside the flatten function Try this : const arr = [[1,2],[3],4,6,[7,8],9,10]; function flattern(arr){ return arr.reduce((array,val)=>{ return array.concat(Array.isArray(val)?flattern(val):val); },[]); } console.log(flattern(arr));

[@manpreetjord1885]

Nice solution

[@prasankumar4306]

Nice videos please do more

[@harish1015]

Hii Nisha, Make videos about patterns nisha

[@saurabhkawatra8938]

Amazing 👍🏻👍🏻👍🏻 mam could also tell about '... ' how to use this 3 dots

[@NishaSingla]

Please checkout my Javascript playlist. I have added Spread topic kzbin.info/www/bejne/h6vafIFnqLaha7s

[@devloperadda1350]

Thank you 🙏

[@NishaSingla]

Thank you :)

[@niteshparmar9019]

More simple way is arr.flat(arr.length) Or arr.flat(2)

[@decadewgame9802]

sometimes flat methods is not allowed

[@niteshparmar9019]

@@decadewgame9802 JS as an evolving language giving us new features every year and almost every langauge is making itself better day by day. We should be aware and also be using the new things a langauge offers, that's my point. And at the end it only matters you did the task.

[@swastikupadhye9291]

Cant we use flat method specifying depth...

[@NishaSingla]

We can use that, but all browser doesn't support yet and it always good to know your own implementation, as when you will some custom requirements than you might need to write your own implementation

[@swastikupadhye9291]

Yes, you are right, implementing your own logic in the native JS is way better.

[@dharmaraopalli6800]

Hi Nisha can we do the recursion for brackets also like {{{}}{}}{}. I want to arrange it in an order .if yes please explain in one class

[@karthikeyanjagan7832]

Hi Nisha Please explain Closure

[@NishaSingla]

I have added video on Closures too, checkout the playlist

[@sunilkumar-zf4dx]

function flat(arr){ let output=[]; console.log(output) for(const ele of arr){ if(Array.isArray(ele)){ output= [...output,...flat(ele)] } else{ output.push(ele) } } return output; } console.log(flat([1,[2,[3],4],5]));

[@josygeorge3115]

it creates a string as the result, but not an array. doesn't solve the purpose...

[@gyanendrarana3941]

The output is not flattered array, it is string.

[@NishaSingla]

We have flattened our array only

[@AhmedMohamed-cf9dd]

all of this code just write arr.flat(Infinity)!

[@raz0229]

The question states writing your own algorithm

[@AhmedMohamed-cf9dd]

@@raz0229 no it didn't

[@NishaSingla]

@@AhmedMohamed-cf9dd We can use that, but all browser doesn't support yet and it always good to know your own implementation, as when you will some custom requirements than you might need to write your own implementation

[@sdwvit]

arr.flatMap(), you are welcome!

[@AhmedMohamed-cf9dd]

Or arr.flat(Infinity)!

[@MrCoder-u9y]

Brother she explained the logic behind it!

[@myvue4587]

Thank you 🙏

[@NishaSingla]

Thank you :)