I was learning Java 6 in highschool. One day my brain wrinkled and I asked the teacher a big question:
“Why can’t methods be more like variables? I want to try, like, making an array of methods out of it”
My teacher, bless his heart, replied:
“I’m just a P.E. teacher filling in electives because the county can’t afford to hire anyone with a computer science degree, but go ahead and install whatever you want if you feel like experimenting”
So I stumbled around Google for a while playing with phrases like “passing methods without anonymous inner classes” and “public final methods” until I eventually stumbled across a bunch of blog posts by this guy called Martin Odersky. That led me directly into dropping Java and picking up Scala, the JVM language he designed.
Scala basically blew my world open. I discovered the beauty of first-class functions, immutability, currying, and pattern matching. Unfortunately, Scala was sort of peaking at the the time, so I eventually had to pack up and learn other languages. I experimented with Haskel (too hardcore for me!), Elixir (good but tiny ecosystem), and Groovy (cool, but unfocused). I always ended up returning to lame languages like JS (meh…), Python (ugh…), and Lua (ugh!!) because that’s where the projects that most interested me were happening.
These days I mostly work in JS professionally. It’s not ideal (hungrily eyes tc39/proposal-pattern-matching & tc39/proposal-pipeline-operator)… but my FP background still has a lot of applicability in JS-land. I frequently receive compliments on my code and I attribute a large part of that to the lessons and discipline which FP has taught me.
Quick little followup question to my own comment: I’m considering picking up Rust because I’m a big fan of what they’re doing with immutables and pattern matching. Are there any Rustaceans on the subreddit? What do you think of it as far as the FP experience goes?
Rust is not a FP language. It’s an imperative language with restricted state and a few FP constructs included.
To me what makes a language FP is the mindset and that boils down to deciding to fold instead of loop and you lean to closure captures instead of declaring variables. Both sides of these are basically equivalent but having a function as the big hammer you use to nail everything together is what makes it functional programming instead of X programming with some functional ideas carried over.
When people structure a request like this they’re generally after a way to really get into the ideas and the best way to do that is to use a language that’s built around FP ideas. I personally recommend Clojure and OCaml. If you’d like to do Scheme via the Wizard book then that’s fine as well. I don’t really like the pure functional languages (Haskell and friends) because I think that state is a useful thing in small doses and don’t like jumping through the extra hoops to get at it.
Rust is not a purely FP language, indeed, but I think it’s absolutely fine to program almost only FP in it, then you have almost no issues with the borrow-checker. Though since it’s a multiparadigm, I obviously decide for each problem the best approach which is not always FP… Often it’s just simpler to read imperative code. But I almost always default to fold in Rust anyways.
Though e.g. currying and the likes is certainly more fun in real FP languages (like Haskell).
The more experience I get in all these languages the more I think Rust has found the “perfect” balance of paradigms and readability (well at least to date). But this is obviously also a matter of personal preference… I’m really looking forward that all the boilerplate is reduced when programming with a lot of generic trait-bounds (i.e. more inference where it makes sense), I think this is still an area where Rust could improve (also compile times, like incremental trait solving).
As someone who’s been toying with Rust for a few years but hasn’t written anything substantial in it yet, I really like the functional features it has. I find the pattern matching to be an incredibly clean way of managing temporary scopes that are only needed to define a single variable.
Likewise I find the restrictions imposed by the compiler to be useful for writing extremely clean, explicit code. One of the bigger issues I find with reading other people’s Scala code (for instance) is that syntactic sugar of the language leads to a lot of implicitness, which can lead to a much longer period of parsing the code before it could otherwise be safely modified. With Rust it feels much more like WYSIWYG, and if there’s any doubt if you can do something safely in the language, you can just mash compile till you’re safely inside the guard rails.
That said, I do agree with the other commenter that it’s not primarily an FP language. It is however, a highly productive language to write code in once you get past the initial learning curve, IMO.
I consider myself a relatively experienced Rust programmer (5+ years experience, 2-3 years professional).
I think it excels in most aspects, but advanced “type-meta-programming” and currying. But I think even this may be a good thing, because often higher-kinded types and lazy-evaluation is either mental overhead or leads to unpredictable performance (looking at you Haskell), so that the programmer doesn’t get the idea to get too fancy, when the issue at hand is much more simple. Also often the syntax is a little bit boilerplaty compared to something like Haskell, but also this could be seen as a good thing, as everything is “documented” within it, IMHO it feels easier to read that way (as long not, something isn’t hidden behind a crazy (proc-)macro (which still can be a good thing, but should be used carefully)).
Non the less I think it could improve with more advanced type-metaprogramming (and inference), because often you have like 5 lines of trait-bounds that are not really interesting for the end-user and should IMHO be inferenced (and communicated by the compiler otherwise). But I think after reading a few articles of compiler devs (like https://smallcultfollowing.com/babysteps/blog/2022/09/22/rust-2024-the-year-of-everywhere/) I think this will indeed improve soon, and it did already considerably over the time I’m programming in Rust.
I was learning Java 6 in highschool. One day my brain wrinkled and I asked the teacher a big question:
My teacher, bless his heart, replied:
So I stumbled around Google for a while playing with phrases like “passing methods without anonymous inner classes” and “public final methods” until I eventually stumbled across a bunch of blog posts by this guy called Martin Odersky. That led me directly into dropping Java and picking up Scala, the JVM language he designed.
Scala basically blew my world open. I discovered the beauty of first-class functions, immutability, currying, and pattern matching. Unfortunately, Scala was sort of peaking at the the time, so I eventually had to pack up and learn other languages. I experimented with Haskel (too hardcore for me!), Elixir (good but tiny ecosystem), and Groovy (cool, but unfocused). I always ended up returning to lame languages like JS (meh…), Python (ugh…), and Lua (ugh!!) because that’s where the projects that most interested me were happening.
These days I mostly work in JS professionally. It’s not ideal (hungrily eyes tc39/proposal-pattern-matching & tc39/proposal-pipeline-operator)… but my FP background still has a lot of applicability in JS-land. I frequently receive compliments on my code and I attribute a large part of that to the lessons and discipline which FP has taught me.
Quick little followup question to my own comment: I’m considering picking up Rust because I’m a big fan of what they’re doing with immutables and pattern matching. Are there any Rustaceans on the subreddit? What do you think of it as far as the FP experience goes?
Rust is not a FP language. It’s an imperative language with restricted state and a few FP constructs included.
To me what makes a language FP is the mindset and that boils down to deciding to
foldinstead of loop and you lean to closure captures instead of declaring variables. Both sides of these are basically equivalent but having a function as the big hammer you use to nail everything together is what makes it functional programming instead of X programming with some functional ideas carried over.When people structure a request like this they’re generally after a way to really get into the ideas and the best way to do that is to use a language that’s built around FP ideas. I personally recommend Clojure and OCaml. If you’d like to do Scheme via the Wizard book then that’s fine as well. I don’t really like the pure functional languages (Haskell and friends) because I think that state is a useful thing in small doses and don’t like jumping through the extra hoops to get at it.
Rust is not a purely FP language, indeed, but I think it’s absolutely fine to program almost only FP in it, then you have almost no issues with the borrow-checker. Though since it’s a multiparadigm, I obviously decide for each problem the best approach which is not always FP… Often it’s just simpler to read imperative code. But I almost always default to
foldin Rust anyways.Though e.g. currying and the likes is certainly more fun in real FP languages (like Haskell).
The more experience I get in all these languages the more I think Rust has found the “perfect” balance of paradigms and readability (well at least to date). But this is obviously also a matter of personal preference… I’m really looking forward that all the boilerplate is reduced when programming with a lot of generic trait-bounds (i.e. more inference where it makes sense), I think this is still an area where Rust could improve (also compile times, like incremental trait solving).
As someone who’s been toying with Rust for a few years but hasn’t written anything substantial in it yet, I really like the functional features it has. I find the pattern matching to be an incredibly clean way of managing temporary scopes that are only needed to define a single variable.
Likewise I find the restrictions imposed by the compiler to be useful for writing extremely clean, explicit code. One of the bigger issues I find with reading other people’s Scala code (for instance) is that syntactic sugar of the language leads to a lot of implicitness, which can lead to a much longer period of parsing the code before it could otherwise be safely modified. With Rust it feels much more like WYSIWYG, and if there’s any doubt if you can do something safely in the language, you can just mash compile till you’re safely inside the guard rails.
That said, I do agree with the other commenter that it’s not primarily an FP language. It is however, a highly productive language to write code in once you get past the initial learning curve, IMO.
I consider myself a relatively experienced Rust programmer (5+ years experience, 2-3 years professional).
I think it excels in most aspects, but advanced “type-meta-programming” and currying. But I think even this may be a good thing, because often higher-kinded types and lazy-evaluation is either mental overhead or leads to unpredictable performance (looking at you Haskell), so that the programmer doesn’t get the idea to get too fancy, when the issue at hand is much more simple. Also often the syntax is a little bit boilerplaty compared to something like Haskell, but also this could be seen as a good thing, as everything is “documented” within it, IMHO it feels easier to read that way (as long not, something isn’t hidden behind a crazy (proc-)macro (which still can be a good thing, but should be used carefully)).
Non the less I think it could improve with more advanced type-metaprogramming (and inference), because often you have like 5 lines of trait-bounds that are not really interesting for the end-user and should IMHO be inferenced (and communicated by the compiler otherwise). But I think after reading a few articles of compiler devs (like https://smallcultfollowing.com/babysteps/blog/2022/09/22/rust-2024-the-year-of-everywhere/) I think this will indeed improve soon, and it did already considerably over the time I’m programming in Rust.