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Reflections on Using Haskell for My Startup (alistairb.dev)
129 points by _query 17 days ago | hide | past | favorite | 101 comments



So, to summarise:

- It is an accomplishment if you get your basic project setupped in 2 weeks

- It is very hard to make popular libraries work together

- 1/3 of the popular libraries are not well maintained, there are no docs and maintainers do not reply to PRs

- It is hard to use latest GHC versions because of the previous problem

- It is hard to get additional devs

- Compile times are ok-ayish but can be a pain

- There is no good IDE and refactoring

But it is still somehow "the best general purpose language"?

And don't get me wrong, Haskell is on top of my list of purely functional languages that I would like to learn.

BUT, if I want to build an actual app and try to earn money from it I would just use something that is very popular, well maintained, easy to push features, easy to deploy and find additional devs for. For me it is ReactJS on the frontend and Kotlin on the backend. OR it is a jackpot if I could just make it in something like NextJS. Haskell can wait for when I earn enough money with other languages so that I can just play with it and satisfy my own engineering itch without any production expectations I have from other languages.


I think his two-week setup time is due to choosing to use libraries and architecture he didn’t understand or worked with before (rebase, fused-effects). I make webapps in Haskell and it takes me 5-10 minutes to setup a project, since I already know what to do.

- “The ‘monad’ abstraction is excellent for dealing with code with a lot of failure conditions (ie. parsing) and avoids ‘pyramid of doom’ type code. Haskell worked out really well in this key area.”

- “Another strong positive for writing Deadpendency was testing. Haskell has a lesser-known style of testing libraries that do ‘property based testing’ (PBT).”

- “Haskell is very safe to refactor thanks to the type safety the compiler brings, which is probably the most important thing.”

- “My core Haskell had very few logic bugs. This is because Haskell is very safe by default and I had opted into strict types that help catch edge cases”

- “At this point I think it is actually pretty stable. I consider the project a big success. A huge part of this has been due to Haskell and its excellent ecosystem.”


It doesn't take 2 weeks to set up an app in a language with a big community of developers, well maintained libraries and at least decent documentation. It probably takes a day or 2. Maybe a bit more if you are venturing into a new ecosystem like switching from Java backends to a node.js backend.

I loved learning Haskell in university. It's an interesting language. I came into intro CS class thinking I could already program & the class would just be about sharpening my axe. Then my intro CS class started with Haskell which threw my brain for a loop and made me think about programming completely differently. That was a great intellectual experience and good for my long term thinking.

Haskell also seems like an incredibly impractical choice for a production language that only a stubborn purist would make. Of course the last bit is purely opinion, your experience may vary.


If you don't know the language and tools it definitely takes quite some time to setup Java, Maven, etc. All the issues with class paths, manifests, and so on, that are just completely alien and opaque coming from any other language make the experience very frustrating.


This. I think a lot of people who use mainstream languages forget what it's like starting from scratch in those languages. Getting a projects setup in Java, C++, C, Rust, etc are all quite difficult.

Getting a web application started in Ruby is easy because it does so much for you out of the box.

There are frameworks that make similar choices for you in Haskell as well: IHP, Yesod, etc.

I think taking two weeks to "set up" a Haskell project is a bit long but I read it as the author taking two weeks to learn enough Haskell to make two rather advanced libraries work together... which means they had to make all the little micro decisions that frameworks make for you, etc. With more experience that could've been done in less time.

If they had started with IHP I think it would've been your usual day or two.


Thanks for mentioning IHP. I've only read its landing page, but if what is has to say about itself is all true and from what is apparent looking at code samples, it definitely deserves to be on folks' radar!

It's enough to make Haskell really seem like a reasonable choice to "jump in with" without fear of never reaching some mundane goal.


Starting a very good starter project in Java/Kotlin is literally next->next->next while selecting what you want (frameworks, maven/gradle, jvm version, etc) in IntelliJ. And if you do not use IntelliJ you can use https://start.spring.io/ or other starter projects.


Starting a Haskell project with IntelliJ Idea is the same next->next->next [1]

[1] https://youtu.be/F0E0aV85GeQ?t=165s


Well, Haskell is too niche to have this...

And if I was new to Java, I wouldn't know which frameworks I wanted...


Javascript: webpack, gulp, sass, react, node, npm/yarn. The whole frontend ecosystem is consolidating but I would not consider this trivial. Experienced programmers coming into Javascript still stumble over these tools.


I think the first 5 minute experience is really good in React at this point.

  npx create-react-app foo-app
  cd foo-app
  yarn start
In ~2 minutes (10 if you had to install node/npm/npx), you have a hot-reloading live site to play with.

That doesn’t make React great nor solve all of the issues that lie between minute 1 and v0.1 in production, but the startup is smooth and painless (for me who comes from C/C++/C#/SQL, and my javascript is at a level where beginners can still help me).


The first 2-minute experience with a Haskell web service:

  curl -L https://nixos.org/nix/install | sh
  
  cat > ./script.sh <<EOF
  #! /usr/bin/env nix-shell
  #! nix-shell <nixpkgs> -i runghc -p "ghc.withPackages (x: [ x.yesod ])"
  {-# LANGUAGE ExtendedDefaultRules #-}
  {-# LANGUAGE OverloadedStrings    #-}
  {-# LANGUAGE QuasiQuotes          #-}
  {-# LANGUAGE TemplateHaskell      #-}
  {-# LANGUAGE TypeFamilies         #-}
  import Yesod
  
  data App = App
  
  mkYesod "App" [parseRoutes|
    / HomeR GET
  |]
  
  instance Yesod App
  
  getHomeR = return $ object ["msg" .= "Hello!"]
  port     = 3000
  
  main = warp port App
  EOF
  
  chmod +x ./script.sh
  
  ./script.sh


What intro cs class uses Haskell as its first language!



The first programming course at Edinburgh is the Haskell course, taught in the first year in the first semester.


Reed College


One of my favorite qualities of the Haskell community is how honest they are about the weaknesses of the ecosystem (we often discuss issues like these, e.g., on r/haskell or in mailing lists). These are legitimate concerns, but the fact that the author is happy with their decision despite these drawbacks is a testament to the language itself.


Good point, that's actually also what I sometimes notice. People complain about something, but still use it. I then think: I have to check it out!


Or as Bjarne Stroustrup worded it, "There are only two kinds of languages: the ones people complain about and the ones nobody uses"

And in fact very detailed criticism can be a good indication that the person is not some beginner frustrated with "that bad feature" but a developer who cares a lot about the technology but is also realistic about the things that aren't as good as they could be.


It has some truth but it brushes away any attempt at criticizing the C++ language and completely ignore that different languages have different level of satisfaction.


> BUT, if I want to build an actual app and try to earn money from it

Not the author, but my reading of his motivations was that the "challenging to learn, but extremely fun to write" part is way more important to them than the "best general purpose language". If your main motivation is to make as much money is as little time as possible then JS or Rails might get you off the ground sooner (although Haskell might catch up in the long run when the type system really starts paying off).

If you enjoy programming in Haskell and are looking to have a good time while building your startup, more power to you for using the language you like.


This is true. I really love Haskell but I can still get some prototype or small script up and running faster in Python.

But that speed flips once you have a larger system and need to maintain it.


With enough experience the speed flips around again. I often use Haskell to prototype things now instead of JS or Python because I don't have to deal with run-time type errors or undefined and the like. I can just write out the types, add some instances, compose things together and get feedback from the compiler if I'm on the right track. For me it's a much faster feedback loop than JS or Python.


It's not really about productivity in the language itself. It's more about the library ecosystem. Numpy and scipy are just so good and nothing really compares. I'm not skittish on writing the algorithm I need myself in Haskell. But when I'm prototyping and quickly trying stuff it's just so much faster if I can call a function and be done with it.


I still wonder about this. I'm competent enough at Haskell to have made several additions to GHC itself, though I readily admit I'm no SPJ. I also believe that for a general purpose program, Haskell _should_ be a good choice. But in practice I make mostly web apps and no amount of "write down the types then fill in the gaps and compose it all together" can replace the amount of scaffolding that things like Rails give me.


> - It is hard to get additional devs

Hey you just threw that in yourself. That's cheating! I think it's actually easy to get Haskell devs. I'm capable and I apply to every Haskell job. I never get hired so I imagine companies have no trouble finding other even more capable Haskell devs.


Sounds like the difference between the language vs the ecosystem.

Compare and contrast how happy are users of Java the language vs JVM the ecosystem (Clojure, Scala, Kotlin, etc).


With records, multi-line strings, and upcoming pattern matching + virtual threads, I hardly see any need to switch languages. I really enjoy working with Java and JVM ecosystem which is very vibrant and has a plethora of tools/libraries.

I'm happy when I'm productive and ship stuff. I'm unhappy when I have to struggle with obscure/undocumented libraries/tools.


I would totally pick Kotlin for my next project if we haven't invested into F# / .Net so much AND if we were not happy.


Actually Java the language is pretty ok nowadays. And taking into account mature ecosystem, libraries, jvm and IntelliJ IDE, Java is enjoyable to work with.


> But it is still somehow "the best general purpose language"?

Yes.


Yes.

We let some features and monads go and picked F# instead of Haskell.

>> It is an accomplishment if you get your basic project setupped in 2 weeks

More like two hours if you absolutely cluless.

- It is very hard to make popular libraries work together

Not an issue.

- 1/3 of the popular libraries are not well maintained, there are no docs and maintainers do not reply to PRs

Not an issue.

- It is hard to use latest GHC versions because of the previous problem

Not an issue.

- It is hard to get additional devs

Same. Few F# devs out there.

- Compile times are ok-ayish but can be a pain

Not an issue.

- There is no good IDE and refactoring

Not an issue (VS, VS Code, and a few dozen others)

I know it is not as strict as Haskell but we have really a good time so far.


I've definitely also found that getting a project nicely setup can be a challenge in Haskell. That said, I don't see that as a huge weakness from a "pick an ecosystem for writing a production app" point of view. 2 weeks is peanuts in the grand scheme of things and it's a task that you will likely be doing exactly once, so optimising for it has very diminishing returns.


That is only true if you know you're going to be working on something for a long time. But if you're taking the lean/fail fast approach, it isn't something you can know ahead of time.


I'm not sure where you got the second point from, certainly in my experience it hasn't been a bit issue with Haskell.

The third point is the same with just about every ecosystem in my experience, there are libraries written by big open source contributing companies which are completely dead as far as maintenance. I've even been bitten _this week_ by a JS library which is dead in the water.


For someone new to the language, pretty good I would say.


What scares me about Haskell is that it seems even people who used it extensively for a while call themselves "intermediate", and still find themselves in Haskell-shaped holes.

If something breaks and I need to fix it now, I don't want to be fighting with a language that says, "no-o, no shortcuts, use a proper monad", or takes years to master to that level.

Maybe I'm just missing the point.


What you see is the result of the fact Haskell gives you expressiveness to build anything from a shed to a bridge or a sky scraper and people who adopt Haskell are curious by nature and thus go as deep as possible and try to build a small house taking air currents and earthquakes into the equation.

Servant is very complex by itself. It's hard to tell at what scale it pays off. But it gives you more safety than other solutions.

I would love to have the OP on my team, because they have the ambition to build reliable software and I can compromise with them. It's hard to compromise the other way around.


I've used Haskell + Servant help reduce backwards compatibility issues with an iOS app depending on the API. We had Servant automatically generate OpenAPI specs from the API, and then diff them against the version in prod during CI testing.

Certainly possible with other languages + frameworks, but I felt really confident relying on it to catch issues due to the strong type guarantees.


I'm not a Haskell user but am a Scala developer and it has the same sort of thing. But I think it is more about the culture than it is about the actual reality of the language.

First, it is often a sort of humblebrag (as the kids say). I am using this language that is SO advanced that I am a mere intermediate after X years of development. Looks how smart I am for using it. That tends to lead people to dramatically over-estimate how hard it is to become productive in the language.

Second, the emphasis on correctness means that the ecosystem goes to great lengths to explain how all the abstractions work internally and how they are grounded in Category Theory. In other ecosystems (such as Java) they seem to be more focused on talking about the interface and the practicalities of using a library. Spring is extremely complicated but you don't see much ink spilled explaining all the internal implementation details.


I believe you can be fairly experienced and realize there are many parts of the language and its ecosystem that you don't completely understand. For instance in Scala, I've never written any macro or used something like Shapeless in depth.

Spring is a good example too. I used it quite a bit in my junior years and felt like I would never come to master a framework that is so broad (and that felt over-engineered).

This doesn't mean you cannot be productive using a subset of the language. There's a balance in what you should allow in a codebase being maintained by a team of varied skillset. Maybe Haskell is on the extreme end here, but the other way (like Python, JS, Go) is even worse in my opinion.


> Spring is a good example too. I used it quite a bit in my junior years and felt like I would never come to master a framework that is so broad (and that felt over-engineered).

I still feel this way. I work on all kinds of weird / cool technologies on the side and I can’t imagine ever coming to call myself in expert on anything because I only use a subset to solve a problem.


It doesn't have to be a humble brag. Some language ecosystems tend to have a lot of DSLs in them. I consider myself intermediate in Haskell because I don't grok Lens.

I also consider myself intermediate, because I often can't readily grok what are the compiler devs talking about when they discuss e.g. linear types.

I consider myself a Python expert since I can follow PEPs and DSLs with ease.

That doesn't mean that Python is a better language. It does not make the same value proposition.


What scares me about C++ is that it seems even people who used it extensively for a while call themselves, "intermediate," and still find themselves in C++-shaped holes.

If something breaks and I need to fix it now, I don't want to be fighting with a language that says, "it's fine to cast that pointer, don't worry about it," or takes years to master to that level.

Maybe I'm just missing the point(er).

You can repeat this argument for any X language you want.

For me you want to work in a language that doesn't let you cut any corners by default. This is what Haskell and some other FP languages do. I can perform unsafe pointer operations in Haskell but it's going to be loud, noisy, and painful to write. As it should be!

In languages like C++/Java/etc you have to be disciplined and opt-in to maintaining the kind of code that Haskell defaults to.


My point is, the gap between competence and expert knowledge seems to be much wider in C++ among others.

I’m a pretty basic C++er but can use it effectively, if not efficiently. It seems, from the outside, in Haskell you need to know a lot more before even a basic level of effective use is possible.


I can see that.

The effect is pronounced if you're experienced in C++ (and C-like languages in general) and attempt to learn Haskell. There is almost no transferable knowledge from those kinds of languages to Haskell which means you're basically starting from the beginning. That can be infuriating for an experienced developer. It certainly was for me -- twenty-some years of programming knowledge that wasn't terribly useful at all!

When moving from C++ to C# or Rust it's not as big a deal: there are the familiar concepts we can use to bridge the gap towards understanding the missing information.

Haskell is just fundamentally different.

Fortunately though I feel like the "Haskell cliff," is over-stated. The concepts you need to learn to get started and write useful programs is not as high as you might think. The ceiling, like in C++, is really high. Most mainstream languages have, or are planning to add in the next couple of years, all of those features you need when getting started with Haskell: ADTs, pattern matching, parametric and ad-hoc polymorphism, type inference, higher-order functions, and immutable values.

So I think it depends on the code-base you're starting on and what you mean by effective use. If you're trying to contribute to a security analysis tools that uses a lot of type-level programming to encode specification invariants then you'll have a lot of learning to do before you can get started. If you're contributing to a SaaS web application then there's a good chance that only a "basic" level of knowledge about how to program with monads is all that will be required.


Ha! Try C++. Usually when someone calls themselves an expert they're either a fool or lying.


Reminds me of the Deep C slides

https://www.slideshare.net/olvemaudal/deep-c/255


Stroustrup is what?


"Usually" and I stand by that.


> What scares me about Haskell is that it seems even people who used it extensively for a while call themselves "intermediate"

They're not so much talking about the language itself, but more about the way thing can be built in it. That's an open-ended problem, since Turing-complete languages let us use any computatable process.

I might consider myself a 'Python expert', since I've used it for over a decade, written code at the CPython level, all the way up to the metaclass level, built many projects, written extensively about the language, critiqued and discussed proposed features, taught it to others, etc.

Yet I wouldn't consider myself an expert in 'the way things can be built with Python'. For example, I can build Python wrappers for native binaries, but that doesn't imply that I'd come up with a design as clever as numpy. I've done a lot of statistical analysis using Python, but that doesn't mean I could come up with a library as elegant as pyro.ai. And so on.

> If something breaks and I need to fix it now, I don't want to be fighting with a language that says, "no-o, no shortcuts, use a proper monad", or takes years to master to that level.

What do you mean? System.IO.Unsafe.unsafePerformIO lets us write impure code; Unsafe.Coerce.unsafeCoerce lets us bypass the type system. Is there something else you'd want to do?


> So after about 8 months of work I was ready to start getting users.

I caution readers looking for advise on building a start up. Early on, this reads as a post celebrating the joy of programming. Which is great! Working on something you enjoy can be personally fulfilling, but that doesn't mean that it's a start up.

At the end of the day, a start up is a business, and a business needs to make money. The ultimate validation is finding users willing to pay for your service. Waiting 8 months before finding users is a huge risk, and signals that this is is a fun personal project that may generate profit if it happens to find product/market fit.

The author's closing remarks address the idea, but I think they're a little late for a post about building startups.

> Have I spent too much time geeking out on Haskell and not enough time thinking about the idea? I guess we will see .


Step 1: build something and have fun doing it.

Step 2: post something slightly decisive on HN that mentions your product and use case at least 1 time.

Step 3: monitor conversions, wait for signups.

Step 4 (optional): repeat

This obviously isn't bad. I enjoyrd the reading and honestly deadpendancy seems very useful and I'd have never heard of it if not for this post.


Tooling is so critical to the uptake of a language it surprises me that more effort isn't expanded in that area for more niche languages that want to see their popularity increase.

I guess it's a 'chicken-and-egg' problem. Popular languages get tooling investment because they are popular.


The tooling situation has improved a lot in the haskell ecosystem in the last year.

E.g. with Haskell Language Server there's now a good and standard way for having autocompletion, etc. inside VSCode and other editors.

In the web development space we now have IHP, which is like rails but with type-safety. It's already the second largest haskell framework, even though it was just launched last year: https://ihp.digitallyinduced.com/ (Disclaimer: I'm founder of the company that makes IHP)


> In the web development space we now have IHP, which is like rails but with type-safety. It's already the second largest haskell framework

Second to Yesod, I presume? How do you measure size, as in, what exactly is the quantity you measure, and how do you go about calculating/estimating that quantity?


Measured by GitHub stars, which is a good proxy:

https://star-history.t9t.io/#digitallyinduced/ihp&yesodweb/y...

We also have a very active community, e.g. over 100 people in Slack, over 180 in Gitter, over 100 weekly active projects (https://ihp-telemetry.digitallyinduced.com/admin/Events <- here's some telemetry)


Wow, that line is so steep it looks like the number of COVID-19 infections. Congratulations!


Things are slowly improving. For example you now have the Haskell Language Server (https://github.com/haskell/haskell-language-server) which makes it way simpler to integrate haskell into your editor.

I'm using VSCode and the official extension (https://github.com/haskell/vscode-haskell). The default experience is not at the level of what I have with Go or Typescript but already quite good (though it's not that stable IMHO, I have to restart the server more than I would like).

The Haskell Platform (https://www.haskell.org/platform/) makes it simple to install almost everything you need to get started (the compiler, standard libraries, build tools, etc).

It's not there yet, the beginner dev experience is still painful and frustrating, but things improved quite a lot.


I understand the point and I wasn't criticizing Haskell because it isn't just Haskell that has this problem. It was a general observation from my own personal experience working with Haxe, Erlang, and Dart. The tooling for all was mediocre at best in the early days, and all of them gotten better (I lost track of Haxe and Erlang a few years back), but my general observation is that it really isn't enough to come up with a nice language (and all of them were/are nice languages). After the compiler and runtime, the community has to have a laser focus on tooling and bootstrapping because that will be a huge factor in whether the language increases in popularity or not. And we see examples of this all over the place. For example, Rails (and Ruby) become as popular as solely because they were so easy to setup.


Yes, 100% this.


Deadpendency sounds nice, and may be profitable, but it's less a "startup" in the sense of a growth business, and more an indie lifestyle business. It's a GitHub app, like people who sell Word Macros to lawyers. There's a good a chance it would be obsoleted by a small open source project next year.


> (...) making my types strict by default with the StrictData extension. Additionally, Haskell has lazy linked lists as the default list type. Instead I used a strict list type.

Is this the norm for production-ready Haskell codebase - basically throw away laziness?


Strict by default is becoming increasingly popular in production. It makes programs behave a lot more predictably for many common use cases. Extensions are enabled on a module by module basis so if you turn on strictness by default, you can still opt in to laziness if you have certain data structures/algorithms that rely on it.


No


I learned Haskell for a year and went into various books. After that I tried to contribute to a relatively simple open source projects and I realized the real world Haskell is so different than books, then I got discouraged and stop. These days I wanted to pick up Haskell back again, is there any updated resource you can recommend for doing real world Haskell?


>for doing real world Haskell?

Haven't read it but there's a book called "Real World Haskell", which I thought was funny considering your question. Right now I'm really enjoying "Functional Design and Architecture"[1] by Alexander Granin (it does assume you've already got some experience). In addition, make sure to revisit Stephen Diehls "What I Wish I Knew When Learning Haskell"[2].

[1] https://leanpub.com/functional-design-and-architecture [2] http://dev.stephendiehl.com/hask/


The book "Real World Haskell" is outdated.

I'll take a look at that functional design and architecture. THanks.


I'm currently going through Haskell Programming From First Principles (https://haskellbook.com/) and am liking it a lot. It's only been a few weeks so I can't say for sure, but it seems like it's comprehensive enough (1200+ pages) where you'd pick up what you need for real world stuff. To some extent at least; in practice there's probably no substitute for just getting real world experience.

PS: Hi Christian! You were a TA when I was a student at Fullstack :)


What if the project became popular, scaled up and the original developer needed help with it? As Haskell is a niche language, wouldn't it be harder to find Haskell developers to come on board?


I don't know about Haskell specifically, but the question isn't "how many developers are able and willing to work with $language?" but "how many developers are able and willing to work with $language relative to the number of companies hiring for it?".

For example, Elm is still a tiny, niche language, but from what I hear it's relatively easy to hire for Elm because there are many more people who want to work with it than there are companies that are hiring for it.


Our company is also using a lot of haskell for our projects. Since we adopted haskell we had a lot more very talented developers apply.

I think this only might be a problem if you don't want to hire remote.


The talent pool is probably smaller, but passionate. It's many people's dream to write Haskell (or other FP) for a living, myself included.

If I may shill, if anyone is hiring for Haskell or FP roles, please let me know.


IOHK are, and have some fairly team members in the Haskell community :)

https://apply.workable.com/io-global/ https://iohk.io/en/team/


At digitally induced we're always looking for great developers to add to our haskell team: https://www.digitallyinduced.com/JobPositions :)


Yes, it is harder to find developers for niche languages and technologies. On the other hand you have a pool of enthusiasts looking for the opportunity to use something more niche, like Haskell.


This argument + response keep coming up. If a niche language could never pick up steam we'd still be stuck with assembly. All languages started off as niche.

It's more interesting what constitutes niche, AND as the parent notes what constitutes a "language to have enthousiasm for".

VB, JScript, ActionScript, ColdFusion and BASIC are all niche (nowadays), but without enthusiasm its not interesting.

Besides the niche-enthusiasm, there is also something for "usefulness". Haskell+ecosystem (and others in the FP camp) bring a nice set of features to the table not often found in other languages.


> All languages started off as niche.

definitely not. Java was presented at SunWorld. When C# came out there were ads in computer programming zines. Swift came out on a wide concert stage with most of the Apple community having their eyes riveted on the video stream: https://youtu.be/MO7Ta0DvEWA?t=45

All that ensures that the "critical mass" adoption to get the language out of niche status would be a non-issue


Even those languages start off with a small user base, right?

And some return to small user bases :) I think the number of VB programmers has drop to level below Haskell nowadays.


> I think the number of VB programmers has drop to level below Haskell nowadays.

ahahaha

https://trends.google.com/trends/explore?q=%2Fm%2F01dpgv,%2F...


> This argument + response keep coming up. If a niche language could never pick up steam we'd still be stuck with assembly. All languages started off as niche.

No they didn't all start off as a niche. They started off with a small user base of early adopters. Haskell is a niche because it's been around long enough to pick up users. There is a difference between a new language with a small number of early adopters and a niche language that has been around for decades.

And languages like Swift did not start off small.


You're right. A niche is not built in a day.


Our startup runs on Haskell. I was worried about this initially but in practice finding great Haskell developers has been no more or less difficult than finding great developers in general.


Yeah, finding a decent Javascript or C++ developer is actually very difficult - everyone thinks they know C++ and Javascript when in fact only a small minority actually do.


I guess if the business idea really took off, then it doesn't really matter what language is this part of logic written in -- you can already wrap it in as a service with Web API -- or simply rewrote it in another more popular language.


Not all startups bring big VC money, for the real world a full rewrite of your stack usually cost too much to be viable.


In my experience, no.

There are probably more people who use Haskell or want to use Haskell as their main language than there are job openings to work on a Haskell code base.

If you're willing to work with a remote team your inbox will probably never sit empty.


This would mean that whatever the level of the contributors, it would be harder to ship bugs in production.


This is a really nice write up and it sounds like you’ve built a solid foundation for the product longer-term. Nice work.


Scratching an intellectual coding itch vs starting a successful startup seem to be mutually exclusive


I was curious how Haskell helped with the peculiar challenges of building a startup. Did it make it easier to validate business ideas and pivot over time towards profit compared to other languages?


GitHub offered something called Dependabot -- and the point I want to make here is that I've see SOOOOO many semi-active projects (like, dozens of stars and some downstream users) which just ignore the PRs opened by Dependabot.

These maintainers don't even switch off Dependabot, not to say merge the PRs that updates dependencies with potential security risk. And it bothers me a lot....


> which just ignore the PRs opened by Dependabot.

For JS Dependabot becomes a spammer, because there are just so many packages even in a "hello, world" project.

In one of my projects I just gave up and set up auto-approve/auto-merge on minor updates. This is what the commit history looks like: https://i.imgur.com/cC7h7T7.png And there are 20 more major ones waiting for resolution.

My hunch is that in many projects devs just on't have the capacity to deal with the deluge.


Keeping up with a node project is an impossible task, you would have to dedicate one full time developer just for doing upgrades. There are daily updates and a lot of them will just break your code due to the poor testing culture & lack of backward compatibility.


This is absolutely it. For JS we only use it for security fixes now on my team because it was creating too much work otherwise. My personal blog is Gatsby (a decision I now regret somewhat), and gets a couple of Dependabot PRs a day which is ridiculous.


It just looks like using language like Scala would have been so much more productive.


Came for the the advice, stayed for the memes...


Except for the pyramid of doom (which you can avoid with good architecture) this reads more like "why to use go over haskell" (at least for me as someone familiar with go).

I started writing go at the same time i started to work on production with it. In 2 weeks time i had a working service and learned the language, instead of the setup.

Interestingly enough the main problem was the pyramid of doom though (due to various http middlewares)!

Nowadays i don't have issues with the pyramid of doom.

Still it seems that in the long run the benefits are similiar, except for the time it took to build it, so if it was fun i think it was worth it.


I use both and am much happier and much, much more productive in Haskell.

What they don't cover here are any of the benefits of the language. The abstractions of the language provide an excellent toolkit to express the intent of your code succinctly. That makes it easy to reason about, cheap to maintain, and fast to develop.

Go gets you started quickly, but your code will be no more expressive after 5 years of development than at 5 weeks.


I would have thought that a change in expressiveness leads to less maintainability, not more. Could you elaborate on that point?


No, the more expressive the language, the more directly you can have the code model the intent within the domain. As the reader sees the intent and function of the code clearly, they can understand and reason about it better.

As an example, Either-monadic code automates an error check on every line, immediately returning on the first error. The go equivalent is a ton of mind-numbing "if err != nil" checks between every relevant line of code. The go equivalent is mostly mechanical clutter. But all those LOC still add maintenance. People have to read and check them (no wrong operators, no references to the wrong variables, etc).




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