How Function Composition Can Make Your Code Better | Functional Programming

[@MilanJovanovicTech]

Want to master Clean Architecture? Go here: bit.ly/3PupkOJ Want to unlock Modular Monoliths? Go here: bit.ly/3SXlzSt

[@soverain]

The second approach is super clean, removes all the boilerplate that comes from static methods. I very much appreciate your videos about functional programming in C#, keep up the good work.

[@MilanJovanovicTech]

Thank you very much!

[@adiazwise]

Great Milan , you explanation was very clear.

[@MilanJovanovicTech]

Glad it was helpful!

[@birukayalew3862]

Thank you Milan. I prefer the second one because it's more readable and we can passed many validations at once.

[@MilanJovanovicTech]

They both end up doing the same thing though

[@andreibicu5592]

Hi Milan. Another great video. I have one additional suggestion. If the email is null or empty, we need to check on all predicates against it, otherwise we get null reference error. Instead of repeating the check, I would advise to add the check in the Ensure method like this, and the call stays the same as you showed. public static Result Ensure( T value, (Func Predicate, Error Error) hasValue, params (Func Predicate, Error Error)[] functions) { if (!hasValue.Predicate(value)) { return Failure(hasValue.Error); } ... } What do you think?

[@MilanJovanovicTech]

How would that change the overall API usage?

[@andreibicu5592]

@@MilanJovanovicTech The usage remains the same. But in your case, you did not test for a nullable email. In such case, everything will crash.

[@ksofficerofficer7858]

@@andreibicu5592 I just started programming when tf I'm gonna understand what ya'll talking about !

[@krzysztofhandzlik9273]

Very nice and clean. That would be usefull in many cases, thanks.

[@MilanJovanovicTech]

Thanm you!

[@Tamer_Ali]

Thanks Milan, you awesome I hope you talk about Vertical Slice Architecture and compare it with Clean Architecture.

[@AboutCleanCode]

these are not mutable exclusive - i always organize my code base "vertically" and inside each "slice" i use clean architecture setup ;-)

[@MilanJovanovicTech]

I still need to do more research on VSA to be able to deliver on this, but it will happen

[@AndriyBezkorovayny]

@@MilanJovanovicTech, great explanation, thanks! What do you think about complexity? I am using this approach in my private projects, but I have been banned from using them at work due to their complexity. Can you suggest how to cope with that?

[@mrvastayan]

Great video mate, thank you!

[@MilanJovanovicTech]

Glad you liked it!

[@angelldark6426]

I like both options, but would like more examples using class Rusults. I want more practice. Thanks

[@MilanJovanovicTech]

Look for some Railway-oriented programming videos

[@dusrdev]

About the second approach, it is rather unoptimized, firstly because the parameter is a params array object, in the function you can check the length of it and create an array of results to match the length, and use a for loop instead of the foreach, then pass the array to the combine method. This will entirely eliminate the List allocation, because you are already allocating a new array with the ToArray method which you could then remove. Or even more simple, without using the loop, run over the params object with a .Where method, and pass the Enumerable to the combine. For even more efficiency, you could modify the check to add an object only if an error occurred, and combine that with a .Where method.

[@MilanJovanovicTech]

You're welcome to optimize it as much as you want. Great suggestions. 😁

[@TT-nh3qt]

The title is "How Function Composition Can Make Your Code Better | Functional Programming" ...

[@dusrdev]

@@TT-nh3qt the suggestions I made don't make it any less functional, most don't even require changing the API.

[@greyshopleskin2315]

This sounds like an obsession with premature optimization. Indeed, great suggestions about performance.

[@gardnerjens]

i like the idea of having an array of tuples one question, would it not be more functional had you use Aggregate instead of foreach? since you are creating a new type, then folding over the array of tuples you could then pass in the value t, to each function?

[@MilanJovanovicTech]

Yes it would :)

[@microtech2448]

Great video

[@MilanJovanovicTech]

Thank you! I see you're brushing up your FP skills 👌

[@AmirHashemZadeh]

it was perfect thanks

[@MilanJovanovicTech]

Glad you liked it!

[@darwish1337]

hello thank you its was useful , can i ask you how i can learn how i create my own extenision result ? and Function Composition?

[@MilanJovanovicTech]

Copy my code and iterate?

[@andrewseaton5727]

Another great video! Thanks

[@MilanJovanovicTech]

Glad you enjoyed it!

[@antonmartyniuk]

I like the 2nd approach more. Looks much cleaner and has less code

[@MilanJovanovicTech]

I also like it more

[@mahmmoudkinawy2783]

Hello Milan, where to get resources to write a FP code such you.

[@MilanJovanovicTech]

Functional Programming in C#: How to write better C# code 1st Edition by Enrico Buonanno

[@alberthalbert1153]

Thoughts on making videos showing how to build good WPF applications?

[@MilanJovanovicTech]

I have no idea how to build a good WPF application 😅

[@tienbui2814]

What’s the Result library you used?

[@MilanJovanovicTech]

Not a library, it's something I created on my own

[@tienbui2814]

As you said. I had seen full the video and see the Class Result. I think it very helpful to handle exceptions. ❤

[@alexlo5655]

There is a very popular lib which has everything github.com/vkhorikov/CSharpFunctionalExtensions

[@AmirHashemZadeh]

@@MilanJovanovicTech please share it on github or other repos.

[@AmirHashemZadeh]

how could i get the ResultExtensions class?

[@MilanJovanovicTech]

Try this: github.com/m-jovanovic/expensely-server/tree/main/src/Expensely.Common.Primitives/Result github.com/m-jovanovic/expensely-server/blob/main/src/Expensely.Common.Primitives/Result/ResultExtensions.cs

[@10199able]

You are getting closer and closer to F# :D

[@MilanJovanovicTech]

But I won't make the switch 😁

[@AboutCleanCode]

@@MilanJovanovicTech maybe u should consider it if u like functional programming as it is much more powerful for FP ;-)

[@EdsonViniciusSchmitt]

Hey there! On your thumbnail ... composition is spelled wrong ... to me it shows as "comopsition"

[@MilanJovanovicTech]

Lol fixed it, thanks! 😂

[@EdsonViniciusSchmitt]

@@MilanJovanovicTech great video btw! Keep it up!

[@sauravbhatta5303]

Great Keep adding azure cloud stuff

[@MilanJovanovicTech]

Thanks, will do!

[@davlatbek2202]

how can i find this reposiory

[@MilanJovanovicTech]

www.patreon.com/milanjovanovic

[@MilanJovanovicTech]

I share the code on my Patreon

[@davlatbek2202]

@@MilanJovanovicTech thank you

[@eloherbapol]

Nice video! But stop abusing the phrase "I'am going to" every 3 seconds :D

[@MilanJovanovicTech]

I wish I could control the way I speak 🤣