Programming Terms: First-Class Functions

[@kickbuttowsk2i]

Rabbit hole: Classes > Decorators > Closures > First-Class Functions. Thank you Corey

[@tahsintariq8757]

For me it was Multiprocessing > Threading > Decorators > Closures > First-Class Functions. Great videos!!

[@soupnoodles]

this is exactly what happened rip

[@HerambLonkar95]

For me as well

[@konyi449]

@@tahsintariq8757 me too

[@sundaymanali5854]

yeah wtf lol

[@darthvador3699]

*goes on tutorial for decorators* You: If you haven't seen my video on closures, you may want to check that out since I won't be spending a lot of time on them *goes on video for closures* You: if you haven't seen my video in first time functions you may want to check that out since I won't be spending to much time explaining that Damnit Corey... Nonetheless I love the videos, keep up the good work man.

[@coreyms]

Haha, sorry about that. Decorators have a few prerequisites that kind've ended up in a chain of videos. Hope you found them useful. Also, I saw the question you wrote about your calculator app in another comment. I'll do my best to answer that one when I have the chance.

[@berryblast3930]

same

[@darrenandveronica]

Hehe - I want 4 videos deep to get here also. Classes > decorators > closures > here. These are awesome videos by Corey. Each video explains everything awesome

[@zbzb-ic1sr]

You're Darth Vader, you should know how to code.

[@hailstress]

Same scenario over here.

[@FamilyGuySweden]

I ended up here because I was watching "Python OOP Tutorial 3: classmethods and staticmethods". Thats a chain invocation of tutorials :D:D:D

[@Asterite]

haha same

[@privetabdul]

lol same

[@sudarshanjha6737]

🙃🙃

[@preranajoshi8488]

hahah same

[@meghalbisht6768]

same! xD

[@ledosilverknight4619]

Corey is a beast at teaching people how to code.

[@kelleywooten1712]

I find Your Tutorials outstanding in terms of ease of understanding. I am 62 years old and haven't touched a keyboard since dbase 3 and Lotus 1-2-3. You are making my learning experience with Python much easier. Thank you very much. Kelley Wooten

[@sabbywins]

Woooooo Go Kelley!

[@colemanj64]

I've watched half a dozen videos on Python first class functions but only now, after watching this from Corey, do I understand it.

[@akshgpt7]

I've been working with Python for so long, but after watching Corey's videos, I realized how many basics I was missing out on! Thank you so much, you're just amazing!

[@alperakbash]

I have been using python for the last two years, but after watching some of your videos, I have decided to watch all the basic tutorials from your videos, again. Thank you ver much for giving us point of view.

[@dgbene1]

I've made a few attempts at understanding decorators but you really broke it down very well and I got that "why did this ever seem so difficult?" moment. I apricate your pace and the practical examples. Thanks. You have another subscriber.

[@melonelonm6074]

In the decorator closure, I noticed that; log_hi = logger('Hi!) and log_hi(), do not need the function to work. So what is the purpose for the function ?

[@classik305]

you're a freak of nature, my guy. You just took me to that next Python level. THANK YOU!!

[@thsdsyt]

This guy really knows how to explain programming languages. Amazing!

[@shashanknegi7861]

I saw ur first video when i was not able to find a good tutorial on iterators and generators and now i refer to ur videos when i have to know anything bout the language... truly an amazing teacher

[@Deepak-yz5zl]

Some tutorials never gets old! Such a great teacher

[@princeofexane]

I have read so many articles and was still clueless about this concept. I watched your video only for 10 minutes, something that i thought was so complicated, understood in a jiffy. You are awesome. Thank you so much.

[@rishabhmishra2908]

finally found someone who got me crystal cleared with first class functions, closures and decorators...... good work Corey !

[@eugen3775]

Nice vid , one mention though, @5:13 in the video, in the for loop of javascript , I think the correct line is : result.push(func(arg_list[i])); this way you use the actual array items instead of generating one yourself with i value. Also this way you can let var i = 0 . Thanks

[@iamviccckkk]

I know this is an older video but I just wanted to say how much your videos have helped me to learn Python! I've made my first ever little programme the other day and seeing it actually work and do stuff amazes me. You have made learning Python so much easier than other resources I've looked at. I haven't had the need to use first-class functionality, but your explanations and examples have made it make so much sense! Thank you so much :D

[@artihlec]

6:30 Corey, you a little bit messed up with your JS my_map function :). It behaves in this particular case as its python counterpart only because an array has values [1,2,3,4,5], try to change items in an array(list) and JS results will do not match with python results. It should look like this: function square(x) { return x * x; } function my_map(func, arg_list) { const result = []; for (var i = 0; i < arg_list.length; i++) { result.push(func(arg_list[i])) } return result; } var squares = my_map(square, [1,2,3,4,5]) console.log(squares) BTW. I've been watching you for a wile and today actually decided to subscribe. A good and useful channel, a good explanation.

[@coreyms]

Sorry for the super late reply. Yes, that's right. Others have pointed this out as well. I should have caught that when I first ran the code with the 0 index and got the wrong result. Oops! Thanks for the correction!

[@snoopyjc]

I was about to point out the same thing

[@marflage]

Or you could use For...of, or For...each functions.

[@masterbat8953]

This is by far the best explanation one can find on youtube about the flow of execution, which is so important for anyone to understand really hard one grasp at first in python

[@PunjabiDuoVlogs]

I have never seen anything explained anywhere just like you did. THANK YOU. You are really the BEST teacher.

[@andresvodopivec5950]

After reading what the dictionaries say in so many words and very confusing, amazing Corey you did it in a single line very clear. This makes me think "you should be hired by dictionary entities to give definitions". Thanks for your help!

[@marting9771]

I like your explanations and the clarity of your voice. Not to disparage other tutorials on here but most of the Hindi speakers are way hard to understand. Thank you for creating your channel!

[@cutefunnyanimals5441]

Crazy how sometimes when you read a book, or some instructions, the concept just doesn't stick because of the poor examples being used. This explanation made prefect sense and now I think I have grasped closures. This is the first video of yours I have watched. You have a new subscriber!

[@oppaarif3975]

Your explanation is really simple and clear. I started to learn js fundamental and stumbled upon first class function concept. Got confused for couple of hours and after watching your explanation made me understand it clearly. Cheers.

[@draosf]

Honestly, you should make a full Functional Programming course. I'm writing this comment and haven't even watched the whole video yet. Thank you so much.

[@KhattyDT]

Been watching a lot of tutorial videos but yours is the best! Simple and straight to the point! Thanks a lot.

[@ManzoorHussain-gz1vk]

I love the ways you teach. My words are not enough to explain how much I love your teaching style and high level content.

[@meatyout]

Thanks, Corey! Great tutorial as always. However, I think it's important to make it clear that the examples you're giving are just intended to illustrate the concepts of first-class/higher-order functions, etc., and that the same results can be achieved in a more simple and/or readable way: Examples 1 & 2: def exp_list(exp, lst): exped = [i ** exp for i in lst] return exped print(exp_list(2, [1, 2, 3, 4, 5])) # outputs [1, 4, 9, 16, 25] print(exp_list(3, [1, 2, 3, 4, 5])) # outputs [1, 8, 27, 64, 125] Example 4: def wrap_text(tag, txt): print(f"{txt}") wrap_text("h1", "This is a headline") # outputs This is a headline wrap_text("p", "This is a paragraph") # outputs This is a paragraph

[@pythonicd1239]

I know I'm late but I have to say, THANK YOU!! I mean your videos are just perfect, your teaching is amazing, you explain everything so clearly, the quality of the audio and video is also just amazing! Best videos for learning python(and other programming languages) on KZbin.

[@Colstonewall]

Very nice. Well thought out examples for a topic that's rarely covered.

[@heshankumarasinghe3159]

This video helped. I have been trying to understand higher order functions and have seen a video on another channel and that video made me confused even more. This video really helped. Specially the fact that you used a semi real world example when explaining why would we ever want to return a function from a function helped me understand the importance of higher order functions more. Thank you.

[@temporary_variable]

Your explanation helps me internalize the topics , I mean they fall at the right place, they are meant to be with ease. Thanks a lot.

[@mau_lopez]

Excellent video. This is kind of abstract, but with this excellent explanation and simple examples that do not involve other complications but just illustrate the point at hand, everything is clear. I'm really enjoying this and the other Python tutorials from Corey Schafer. Thanks a lot!

[@remedyiq8034]

Best videos on youtube. The way you explain concepts are simply amazing

[@bernoulli9047]

The wrap_text function example after 11:00 would look very nice and readable with python3's f-strings. Thanks for all your hard work, Corey! I really love your videos.

[@cryptotv3013]

Awesome explanation video for both languages, I was struggling past one week on this topic watching more videos finally figured out all.

[@andresa249]

in 11:00...15:00 we could execute wrap_text subfunction also this way: html_tag('h1')('Test Headline') so in first brackets we have parameters for main function and in second brackets we have parameters for subfunction. Understanding that - it's much easier to understand what happends between 11:00...15:00 Corey, thank you for very good tutorials.

[@aashayamballi]

Man! Corey you're really great at explaining things, my mind actually blown... Thank you so much!

[@abhilashkaluwala]

i was struggling to understand this concept, this is the BEST EXPLAINATION ON THE INTERNET.

[@mahmoudreda1083]

classmethods and staticmethods >>> Decorators >>> Closures >>> First-Class Functions. Keep the GOOD work Sir!

[@adrianayon5513]

You did an amazing job explaining this, bravo my good sir!! A like and a sub right here all day!!

[@ashwinsingh1325]

Was trying to learn python syntax for ML and this has really cleared things up! Don't know if you take suggestions but I write notes down for you videos and would love it if you could provide a textual overlay of what topic you're covering. Had to playback a few times to figure out when you switched from passing function example to the return function example.

[@dequationblog]

Fast becoming a fan here, Mr. Schafer. A+ on the didactics and presentation.

[@millaw.1718]

Thanks a lot for the explanation! I was so confused with decorators, now it makes so much more sense to me :) You are just amazing!

[@evergreen7673]

Hi, I've started to learn with You this year. You do a lot for other people . In this not easy time develop skills, and learning is the one thing which so meaningfull (sorry for my english, I hope its clear :)it gives hope and enjoy:)The way You speak is perfect, also for people who don't speak english very well.

[@glitchedgitz]

This guy is beast at explaning these complex logic. Thanks For Videos🔥🔥🔥

[@YeekyYeeky]

when I face some difficulty in understanding python concept , I will first search to see if Corey have video about that topic , Thank you very much

[@iautomatecloud9305]

Hi Corey, thanks for your videos. It certainly helps me clarify concepts and I appreciate what you are contributing to the community. It all works as an explanation, however there are two errors in your JS code that impact the result. Below is version 1.1. I've added it here so other viewers can see a working example of cube and square would get the expected result. I don't think markdown works here, so hopefully other viewers will be able to understand the code in this format. ``` function cube(x){ return x * x * x; } function square(x){ return x * x; } function my_map(func, arg_list){ result = []; //for(var i = 1; i

[@joxa6119]

The series is super helpful for a person like me that has no computer science background.

[@AriaHarmony]

Thank you so much! Your vids are super clear and useful!

[@meatyout]

+Corey Schafer Thanks very much for all your great tutorial, Corey! FYI, there's one mistake in your my_map() function example, using cube: it should read: cubes = my_map(cube, [1 ,2 ,3 ,4 ,5]), then print(cubes) instead of squares ---> print(squares). And you can but you don't "have to" move the cube function above with the square function. No big deal, just in case it confuses some people.

[@ayushgupta1881]

It was really easy to understand the concept in the manner you taught. Thank you !

[@simonaugustocarroz4447]

Well explained and to the point, i cant believe this guy is real

[@basu_104]

Brilliant step by step build up to higher order function usage. Thanks do much

[@salman.1st]

Oh man, I was trying to comprehend closures for a the last week, now thanks to you I understand!

[@qtran101]

as a new python learner, excellent video +1 and subscribed!

[@TheFallibleFiend]

I especially appreciate your going through the python and javascript together.

[@oadams8]

You genius. I hope you like teaching because we all want more

[@aliyaqoob8779]

Very lucid and the examples made it very clear. Subscribed!

[@mohammadalaaelghamry8010]

This channel is a treasure. i so much appreciate you. You are awesome.

[@ChaosArtist]

Thanks for this explanation of First Class Functions and the examples provided. It also helped me understand the map function better.

[@richardwalters9249]

Love these videos ... I see at 04:14, you looked to demonstrate that you can pass a function to another function as an argument. But, you already demonstrated that with the print() function. But the map() function reinforced the idea ... btw, you’re presentation of material is perfect - not too slow, not too much. Very very well demonstrated too. Nice teaching style.

[@AhmadShrif]

Big fan of your tutorials, very well done and very organized. I would like you to point to an error in your javascript code at 6:27. The error you got can be resolved by adding arg_list[i]) not i to the func() as below: function my_map(func, arg_list){ result = []; for(var i = 0; i < arg_list.length; i++){ result.push(func(arg_list[i])); } return result; } The fix you did will only work if the arg_list is starting with 1 and incrementing by 1. Because you will always operate on the index numbers not the item in that index.

[@Glashome]

great example for the utility of returning a function. Really helpful

[@STFU665]

Very well explained. Thank you very much. I know a lot of programming languages, but everytime i learn a new one i got the feeling, that the concepts are just "Pointers of C in more complicated". But maybe that's just me :D

[@manushyamusic]

You made it so easy to understand. Thank you so much.

[@20dorko]

Thank you so much Corey, this is really great video. I've only seen this one from you but definitely I am going to check more of your Python videos. If others are also as good as this one, I will support you, you have my word :) . Thanks again.

[@bermetumarova4683]

Thanks, finally I understood what is first class functions.

[@nriezedichisom1676]

Just beautiful. Almost like art. Thank you again Corey

[@hubertcombomarketing2693]

You're amazing guy Corey. Thank You very much for Your work.

[@coreyms]

Thanks!

[@PrinceKumar-um8mw]

Very useful Tutorial Corey..Really liked your way of explaining the concepts..

[@tomaspinto3833]

Great, thank you very much! I've been using this without knowing the term, it's really helpful to see it on a easy to understand language like python, i saw this on class but the examples were done with a functional programming and for someone that has only been in procedural programming, it was really confusing

[@Descart330]

The more closures you add, to closures, it makes more sense as you're like, saving information to make a function be used for a specific purpose.

[@DeTeK-Dennis]

Great videos Corey. True teacher by heart !!!

[@ShynggysZ]

Hey Corey, it would be great if you add these two videos (First-Class Functions, Closures ) into a Python playlist (after Function video). It would be perfect continue and flow in that playlist. You have the best Python tuts in youtube (I guess not only in youtube)

[@WaitingWithin]

WOAH Had no clue you could do that. I am now going to watch your 47 videos. Great Job!

[@karsten600]

Made me understand first class functions, thank you Corey.

[@WarrenMarshallBiz]

Fantastic video and crystal clear explanation, thanks so much!

[@tradertube]

Nice side by side video ! Both are my favorite languages ! Thanks for sharing!

[@manjeetrohilla7414]

this video solved many doubts, from map to first class function to closures and I just realised at 11:00 you can use lambda function instead of wrap_text

[@parmachine470]

Finally got it. no wonder so many courses drop the ball at closures, decorators, getters setters. Hard part is seeing the inner is accessed by a variable defined as the call of the outer.

[@gusirity]

Such a good teacher! You make things very clear in a very short time :)

[@cigdemylmaz1532]

I started with python beginners, tutorial #8 on Functions, then Classes.. in order to learn decorators I needed to learn closures.. I have to go back to beginners tutorial #9 at some point :D Thank you so much for amazing lectures...

[@user-zo2ky4mz7d]

Hi Corey, this is the best explanation of this topic i've seen on youtube so far. However I have a few questions: What's the difference between these two approaches of executing high-order functions. Are there any advantages of using one over the other. What is the best way to execute a HOF. 1. print_h1 = html_tag('h1') print_h1('Test Headline') print_h1('Another Headline') 2. html_tag('h1')('Test Headline') html_tag('h1')('Another Headline') Thanks.

[@angelikaprzeliorz8325]

I appreciate your work, you're awesome. Do what you do and help others, because you're doing it great.

[@alejandronieto576]

Thank you very much Corey, very good explanation and examples!

[@Achrononmaster]

Another use case is to allow a user to select what type of algorithm they want to use for a solver. A generic solver wrapper can then be used to call the algorithm (function) option the user selects at runtime, without having to class everything. Also useful for profiling different functions which perform the same task.

[@AnupamPatel02]

Great explanation Corey, especially I liked the concept or illustrating it in Python and Javascript

[@markrity]

It was nice and clear , but in my opinion there is no need in showing it in 2 languages , a specially so similar. Its just makes the video longer , stick up to Python coz' of its easy readability :) Good luck. Keep up with the good work. P.S. Make more of Programming Terms videos ))

[@DoJoStan]

I actually found the side by side comparison of JavaScript and Python extremely useful. I'm learning Python right now but have used JavaScript for around 2 years and having Corey explain the concept in both languages makes learning the concept in Python alot easier.

[@MoAam-n6b]

hello the best teacher in youtube "can you plyz make a video of the short cuts keybord like how to select and uncomment the code ...?"

[@elevendarter]

I've learnt about the Higher Order Functions today and when it wasn't clear I knew I had to check your channel what's your take on it. I'm so glad you mentioned it's sometimes complicated even for for you (at least to explain it...) I think I can go to bed without thinking I'm a complete idiot :-))) BTW, the example with the tags was the first example I've seen that kinda made a sense why would someone use it at all.

[@lepidoptera9337]

They are rarely needed. The number of times you will write an algorithm in your life that will profit from them can be counted on one hand for an average programmer. I thought I needed them once... until I discovered that there was a much better way that didn't use them. ;-)

[@souranumaji4213]

Some people are disliking the video. Either the don't know the alphabets of English or some random guys who don't give a damn about programming. BTW Corey's series is the best I have ever encountered.

[@kneelesh48]

Corey is a great teacher

[@youcefguichi3132]

almost 2023 and still very helpful, thanks a lot for your tutourials

[@SeaTaj]

You are a light in the dark. Thank you

[@SabbirAhmed-ym4yf]

I feel comfortable to think like that-> the upper function creates a template for the inner function which then works on variable over the template to produce output.

[@alberkulicka954]

I felt extremely dumb after watching the video and still not getting the point, but then an idea came up in my head and made this example, where I finally understood. Might help you as well def custom_sum(first_num): def wrap(second_num): print(first_num+second_num) return wrap two_plus_something = custom_sum(2) two_plus_something(5) two_plus_something(10) two_plus_something(20) output: 7 12 22

[@gururajchadaga]

What a fantastic explanation

[@GaneshVernekar-rp7sk]

6:36 if u find difficult Then heres the information Here we r equaling my_map function to variable named squares and my_map takes arguments as square and list of no. And square argument is operating the square function but not excecuting it.and then result variable which is empty And equating value of i to list of no. And then using append mtd func(i) goes to square function and returns the value to result variable and later return result bcoms equal to square and at last we print it using print(squares)

[@Vish_27-v8x]

One word, I have for you Corey! Just brilliant!