What Is Recursion - In Depth

[@baronfuller3112]

This guy is for sure my go to when needing to learn a topic. Would recommend to anyone.

[@bhuppidhamii]

yes, he truly is!

[@quintenkamphuis]

Hi from The Odin Project! I coded along and am very proud to say that I got every single one exactly right.

[@GrantH2606]

Hi from the The Odin Project! I coded along and am not proud to say I am totally lost on understanding recursion and am on the brink of throwing in the towel.

[@fsl72]

@@GrantH2606 did you throw in the towel?

[@GrantH2606]

@@fsl72 I decided to continue despite not understanding recursion

[@fsl72]

@@GrantH2606 so did you skip the recursion-related lessons?

[@GrantH2606]

@@fsl72 no, i went through them all but had to resort to using chatgpt to help me get past it. I just couldn't wrap my head around it.

[@ozzyfromspace]

This is a hundred times better than when my professor tried to teach our class recursion. Boy, that was a train wreck 😂. You're a national treasure, Kyle! Thanks so much for everything you do 🏆☮️🙌🏽🎊

[@kmchow4971]

He is an international treasure.

[@theretroman3862]

Freakin' finally! I understand recursive functions! Not only that, but now I am starting to see how algorithms play a role in making the life easier! Thank you so much man! \m/

[@VladdyHell]

Recursion is the most confusing concept aside from asynchronous programming even though I've read from a lot of resources, but you explained it very very well and it's actually very easy, your explanation is just 🔥

[@justinreeves8336]

What makes your videos so good is the thought that goes into creating the examples to explain. So many other authors "showboat" overly complex examples to show how clever they are, which completely misses the point. You nail it every time. Cheers Kyle.

[@IkeVictor]

i have watched 15 recursion videos and this seems to be the most clear and concise. Congrats, here is your trophy 🏆 .....lol

[@mohammedalmukhtar8949]

Thanks for this video, Kyle! I used it to create a factorial function function printFactorial(n, total=1) { if(n

[@WebDevSimplified]

Nice job! I love to see people taking my videos and expanding on them.

[@angelcaru]

I have a simpler implementation: function printFactorial(n){ function factorial(x){ if(x === 0) return 1; return x * factorial(x-1); } console.log(factorial(n)); }

[@stith_pragya]

Thank You So Much for this wonderful video............🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻

[@SnowblindHallur]

Recently bumped into your channel and just have to say you deserve mad props. Your videos are so simply explained and straight to the point. Keep it up!

[@WebDevSimplified]

Thank you so much!

[@CAPS_AMERICA]

I wished I should have seen this before I took my technical exam! I was using iterative approach all the time (for, forEach) and I didn't have the recursive mindset! You are so awesome man! The detailed way of how you teach, and how you look after your hair! Just great! Go Selsun Blue!!!!!

[@FlightNSurf]

Wow. After years of CS. I finally understand recursion dude. Thank you dude!

[@jadekinstudio]

Thanks! I was really rusty in recursion and now makes sense again!

[@FromTheHeart-777]

You are a blessing to me. Just want you to know. You get straight to the point and use realistic examples. I have passed your channel to fellow students in my bootstrap. Thanks for everything.

[@keerthans2366]

Learning Recursion was impossible until I watched your video sir. This video also helped me to revise complex array and arrow function.

[@nizamuddinshaikh3185]

Vow, so tough a topic, so simple an explanation! Wonderful tutorial! Thank you Kyle. 👍😃

[@MietekPomywacz]

This is actually an awesome video, I gotta say I tried doing everything myself as soon as he explained it clearly at the start that its pretty much similar to a loop but differs with the fact that you choose when to escape it with a condition and I managed to do all of these examples before he has shown a solution. Again, AMAZING VIDEO!

[@3491da]

By far the best explanation for recursion Ive come across, well done and thank you

[@faisalhossain151]

omg the second example was a very nice practical application of recursion. most recursion examples i see on the internet are like fib sequences and factorial, which is alright, but i really wanted to know a practical use of recurison, thank you for the video as always :)) edit: I meant the third example woops

[@WebDevSimplified]

You're welcome. I try to include practical examples when possible because it helps solidify why something should be used, because it is hard to know when to use something if you never see it used.

[@RamadhaniShemahonge]

This is the simplest explanation ever.. May God Bless you

[@nachomarquez7541]

Change the title of the video to "Recursion made damned easy". Thanks a million sir!!

[@Quidoute]

Recursive functions are really useful I use them almost everywhere because it gives more controle of what's going to happen by passing different arguments

[@MrChrisJ74]

Man the web needs more ppl like you. Very good communicator, I am gonna subscribe to one of your courses based on this one lesson

[@chandlerliu3010]

I like this kid a lot!!! --> Very succinct and explanatory (hundred times better than other programmer vloggers on youtube)

[@p2lifau]

bro is really the goat. immaculate patience

[@karthikkumaresan1091]

Its 11:30 in the night and watching this video is the best thing that I did all day!! :).. Thanks!!

[@armandobueno1681]

Videos like this make competitive programming a lot easier

[@iyobosajefferson6457]

This is great! Never seen such a video wonderfully explaining recursion!

[@justhorse3584]

You are the best teacher mate, i mean it. Thank you so much!!!

[@MachiriReviews]

Great video, these things were daunting at first but all the knowledge from others really puts it into a simpler perspective

[@kirtanthakkar813]

Such an amazing way to explain recursion! This is exactly what I wanted! 🙌 Thank you! :)

[@canklc5772]

Best video on recursive functions

[@fithamlakfikrie4657]

great explanation, specially the third example gives a sense to use recursive function, Thank you 🙏

[@RandomNekato]

Thank you very much for the comprehensive explanation. Your videos are a blessing

[@ndbass09]

I know this wasn't the point of the video, but I really appreciated the use-case scenario of a family tree with the tree model. It helped make using that data structure click for me.

[@rimantasdanilevicius6754]

good example. I felt like i need one more a little bit complicated example to get though the logic! Your way of explaining is really good.

[@edyta9877]

Thank you for all your work with this channel! It helps me a lot!

[@aghileslounis]

Give this man a medal !

[@milkybrmaji7192]

Best and easiest explanation

[@rahalmehdiabdelaziz8121]

this video was part of my Bootcamp learning journey and it's very helpful 👍

[@cannabisanomaly]

mind if i ask how it went with the bootcamp? were you able to find a job after it?

[@rahalmehdiabdelaziz8121]

@@cannabisanomaly tIt's very helpful especially for people that have good basics in dev, after finishing the front end part of the bootcamp (before finishing the backend part ) I published my resume and my angellist profile in linkedin (which was a task of the bootcamp) and then I get contacted by on of my previous university colleages that launched a startup and got a front end job,

[@cannabisanomaly]

that's awesome, congratulations! i know some people who go 6+ months without finding a job in the current market. good job my internet pal

[@depressito]

thank you for making these video that make my life so much easier

[@michaelx3553]

This makes so much sense... I love wds the more after every video

[@abhinavs2484]

Greate explanation! but in the last example, you missed out "John"!

[@randerins]

Perfect! You made it very simple to understand

[@andrewlee7574]

Before watching this, I am not sure why we would use recursive function when normal loops can do the job. Thanks for another quality and short video!

[@CAPS_AMERICA]

WE CAN USE RECURSIVE FUNCTION TO READ ROWS FROM THE DATABASE, DELETE THEM ONE BY ONE, THEN INSERT THEM ONE BY ONE, THIS IS IN PRODUCTION ENVIRONMENT

[@good-luck-ugo]

4:25 why do we move up. Shouldn't execution end at the last function?

[@6848811]

Great Explanation. Great Examples. And tells you why it is needed. Good job 👍🏻

[@HaRmonikBeats]

This was an great explanation best I’ve seen on KZbin great for beginners to learn from 💯🔥

[@absolustely.honest82]

Almost all recursive functions can be substituted by a for loop. So this is more of a nice to have than an absolute necessity. Great tutorial BTW.

[@micoberss5579]

My version of sumRange: function sumRange(n){ ... if(n

[@WebDevSimplified]

Nice job!

[@how_to_bim6341]

in this case better than the original ;)

[@Tijme]

My version of sumRange: function sumRange(n) { return n === 1 ? 1 : sumRange(n-1)+n; }

[@coreyheckler7891]

These videos are fantastic. Keep up the hard work dude!

[@WebDevSimplified]

Thanks!

[@davekaushik4863]

Thank you so much for this video, recursion makes a lot more sense thanks to you!

[@p86167]

Such a good example and made things super easy

[@acanthoscurriageniculata7141]

This video is really helpful if you pay attention. To anyone who doesn't understand some part of it, try to focus more on call stack

[@lukehatcher98]

You are an excellent teacher

[@greenie62]

A benefitting 13 minutes that was. Well done. 👍

[@HillelGarciaAustria]

Very nice stuff! You explained it very good. Thank you. Just once thing, in the sumRange function, you don't need the total param. It gets accumulated with the same function recursion, like so: const sumRange = n => (!n) ? 0 : n + sumRange(n-1);

[@adrianojedaf]

I got a bit lost with the last example. I will come back to check on that again later. Excellent explanation.

[@chrisoleary8401]

Thanks for this video. Where I'm still confused though is in trying to understand how the variable 'child' works in this recursive function. I don't see 'child' defined as a variable within the tree, so how does the function recognise it? How does the function pull the name values (e.g. 'John', 'Jim' etc) from **child.name** when in the tree, these are the values of the *children* property, not child? I'm also still struggling to understand how recursive functions "go back up through the loop" (i.e. where you show it returning in reverse order at 4:52). That just doesn't make sense to me at this point. I don't think it's overly important because I at least understand how a recursive function behaves now. But understanding why it does this still isn't clear.

[@robhills1]

A bit late in the day, so may help someone else, first suggestion is understanding JavaScript ES6 - essentially what is happening is "child" is the variable name given to the results of "t.children.forEach", another way to look at it is if the JSON file was obtained using the "fetch" api you could do something like this (note that there are no variables called "res" or "data" beforehand, these are part of the ".then" methods and declared within them - so firstly create the JSON file (call it "children.json"): { "name": "Bert", "children": [ { "name": "Jim", "children": [] }, { "name": "Zoe", "children": [ { "name": "Kyle", "children": [] }, { "name": "Sophia", "children": [] } ] } ] } In your "script.js" comment out the "const tree = ....." and add: let tree = fetch('children.json') .then(res => res.json()) .then(data => tree = data) Run the application as normal - hope this helps and explained somewhat properly - someone with more experience could definitely improve on this, but my rudimentary understanding anyhow :).

[@erikalonso5782]

@@robhills1 Thank you! I'm still struggling to understand this, but now I know exactly where to look at. Thank you! I though it was a JS property...

[@mikemaer]

You are a great teacher, thanks my dude!

[@Raj-ur7lg]

Very good explanation...thank you Bro for your time!

[@Alexjay1234]

Thank you for explaining how that works in psuedo code. That really helped me.

[@NITESHSINGHNRS]

best teaching technique.....

[@1flybyguy]

Really needed the tree recursion example! Thanks!

[@matthewblasco4720]

omg thank you for this!!! I literally needed this because I solved the tree problem using multiple maps XD didnt know recursive is a thing and a few line of codes only

[@marlon4008]

Thank you for sharing these videos. they are so helpful.

[@PatrikRasch]

Nice explanation as always 🙌

[@joedunder4439]

Another excellent video and another perfect hair day.

[@18.michaelmaramag89]

Awesomeness! Now i understand recursion..

[@brecoldyls]

I like how you used tail recursion in the second example. I think it’s clever how you used default arguments to avoid having to make an auxiliary function, I never thought of doing that before 😮

[@james.kaloki]

Dude thanks a lot I was seriously struggling to learn this concept in school

[@martinacosta9972]

When im confused, and see you have a video on the topic, i know soon i wont be confused

[@ervinselimovic4888]

Wonderfully explained, thanks!

[@mikeba3809]

You should change your article about recursion so that the coding examples match up. I found the coding examples you used in this video to be more familiar and hence, more relatable, than the ones you used in your article.

[@osvaldodiasdossantos6625]

Not an easy topic to explain, it seems, but you did it. Thanks.

[@tiagolelinskimarin4242]

I thin it doesn't get any clearer than that! I would just add some more console.logs there in some places to illustrate a little further some functions. But the way he explains is just amazing!

[@Ceyhus]

Great channel! Thank you so much!!!

[@asadurrahman1681]

your channel saving my life

[@certifiedmicronaut4901]

Thank you so much, Kyle!

[@charlotte.upandaway]

This was super helpful! Thank you so much!!

[@dawnofhopee]

Thank you very much for the amazing explanation!!

[@hungpewnoy2081]

this problem is so complicated to me and you has just solve my trouble in 13' . so worthy video,thank you.!!

[@ssimona7317]

Super easy to follow!

[@mariaguadalupeb993]

Thanks for the explanation! really got this now! :D

[@nnokki]

omg you're so beautiful and your voice is so deep😍😍 i was here to learn something but got heavily distracted!

[@saliyapathirana3152]

Great Explanation !!!!

[@luismonasterios8990]

great explaination

[@marieel839]

Such a good explanation, thanks

[@edgardohuezoderas8250]

Thank you! this was very helpful :)

[@tommy10436]

Thanks, dad. at 4:27, when you say you move back up into countDownRecursive(1)... Why does it move back up in 1, 2 and 3, and not just exit out of the function?

[@leonardoragazini]

exact same doubt I have

[@jitu757]

All your video are to the point and easy to pick up and understand. However, the last example is proving to be very difficult. Why did we need to use the foreach id recursion suppose to handle the loop?

[@JT-iw2cw]

4:30 I thought functions resolved the moment it hits any return statement. I don't understand what it's doing stepping out of the if() statement, returning multiple times. I think it would only bubble up if the if() statement were within it's own function, unless the interpreter sees the if statement as it's own function, which I didn't think was the case. -edit: I understand now, you're not referring to the same function running, but a new instance each time the inner call is made.

[@DanThemes]

Same at 8:30, I still don't get what he's saying. The moment the if condition is true, it returns a value (not the same recursive function again) so that return statement exits the function.

[@revillsimon]

Excellent explanation, thank you!

[@WebDevSimplified]

You're welcome!

[@jalalbmnf]

Thank you 🙏🏽🙏🏽🙏🏽🙏🏽

[@Self-taughtCoder]

Wow, thanks for the video. Really helpful. I also did it like this. I hope it's ok! function sumRange(n) { if (n

[@chisomodimmegwa3479]

dats the way, seems he was overthinking it

[@davidsonfong9549]

thank you, Kyle!!!

[@rodwinpieterse1950]

Recursion making me want to long-jump back into tutorial hell.

[@kurwacherry]

finallllyyyyyyy i get itttt, thank you for this

[@getrogo4474]

Haven't seen the video yet but already liked it..

[@ec4150-k4f]

Great vid, can protect that last function against undefined and null values in the objects by adding something like const children = t.children | | [ ]; then using that array instead of t.children throughout