When comparing Brainfuck vs F#, the Slant community recommends F# for most people. In the question“What is the best programming language to learn first?” F# is ranked 30th while Brainfuck is ranked 76th. The most important reason people chose F# is:
F#'s syntax tends to be terse while remaining very readable and easy to understand without being a chore to write.
Specs
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Pros
Pro Great exercice for your brain
If you ever succeed to use it at least once, whatever it does, you will never be afraid to learn any other programming language.
Pro Very good introduction in geek communities
Say you made a Brainfuck program once, and count how many geeks you will attract.

Pro Designed to challenge and amuse programmers
Rather than have a practical application, Brainfuck is an esoteric language for the purpose of challenging programmers who want to code in a more unusual language.
Pro Concise syntax
F#'s syntax tends to be terse while remaining very readable and easy to understand without being a chore to write.
Pro Easier transition from other paradigms
Since F# is not a purely functional language, it lends itself to being more easily picked up by programmers that have experience with other paradigms.
Pro .NET Interoperability
Since F# runs on the Common Language Runtime or CLR, it has access to the entire .NET Framework, as well as libraries written in other .NET languages such as C#, VB.NET, and C++/CLI.
Pro Multiplatform, it runs on .Net Core
Forget Xamarin and Mono. F# now runs on the multiplatform .Net Core!
Pro You can run F# in the browser
Thanks to a project like Fable, you can write and run your client app in F# and run it over JavaScript. It allows you to share code between your server and client.
Pro Natively supported by Visual Studio
This is a .Net language natively supported by Visual Studio. Though it is not as tooled up as C# the support is still substantial. In particular, C# deployment scenarios can be enabled for it with small C# wrapper projects. Integration with Visual Studio provides: IntelliSense, debugging, projects an other features.
Pro Fall into the pit of success
F# directs you into a workflow where the right way is the path of least resistance.
Coming from a C# background, its restrictions might feel arbitrary at first (e.g., what do you mean my code has to be in dependency order!? Arbitrary alphabetical or bust!), but you'll soon realize that your code is cohesive, concise and consistent in a way that it never was before - and you can compile and run with confidence!
Pro F# is supported by Xamarin
Thanks to Xamarin, F# is a functional language that you can use to build for iOS, Android and Windows.
Cons
Con Esoteric language
Brainfuck is by design extremely difficult to use. This makes it un-learnable to beginners.
Con Impractical language, used only as a toy
It won't get you a job. It is not used in any practical application.
Con It's a joke language
Con Almost as bad as Python, but less adopted.
It's a joke, just like Python, but at least brainfuck admits it ;-)
Con R-rated name
It's difficult to talk about in polite company.
Con Has no ad-hoc polymorphism (á la Type Classes)
You have generics, you have interfaces, you have inheritance, you have a lot of things at your disposal but you don't have Type Clases. They can be emulated using some clever constructs but there's nothing like having the real thing.
Con Infested with OOP
Still relying on .NET OOP libraries.
