[unfamiliar]

Another post convincing me that writing versions of the factorial function is the primary focus of Haskell. I keep hearing about Haskell in production, I would like to see examples of the language actually doing something useful.

[MaxGabriel]

Here's a screencast of me making a blog application with the Yesod web framework: https://www.youtube.com/watch?v=SadfV-qbVg8

While I would also like more production Haskell examples, I wouldn't read much into this webpage—it's basically just a 15 year old joke.

[crdb]

For our last 2 clients (with both, offering a "data team as a service"): the reporting tools were written in Haskell, using Servant [1] which got started trying to do the same at Zalora to set up a customer service management tool. The motivation was that it made painful stuff much simpler and faster to write (performance was a bonus).

It's also used for a bunch of tricky data manipulation problems that were harder to solve using pure SQL. Example: identify a unique customer based on attributes (email, phone, address, etc.) one or more of which can change when a customer tries to create a "new" profile to grab the $10 new customer signup voucher. This ran recursively on the entire customer dataset (12 countries, some customers had created as many as 250 profiles) in about 4 seconds on a m3.medium instance.

We don't/didn't write blog posts or tweets about it though. I think the set of people who write blog posts (i.e. both have free time to do so, the talent, and the motivation) is relatively small, and the number of blog posts and other visible stuff being published is proportional to the size of the community, so you'll see many more Node.js/RoR posts than you will on using set theory to reduce a 5,000-table flawed data model systematically or the kind of everyday stuff Haskellers are doing everywhere. Also, personally at least, I don't feel like I know enough to have much to offer by writing a blog, so I stick to making these semi-anonymous HN comments.

Interviewing Haskellers, I found a lot of examples of similar work - CRUD tasks, web services, etc. built in Haskell within a larger organisation and running quietly in the background. Something small and modular that can be tacked on quietly.

One of the creators of Servant moved on to Tweag [2], a French big data company, where he's working on PB-size distributed machine learning projects for large corporate clients, which I think is where Haskell really shines today. I suspect NDAs will stop them from talking much about it... I've always wanted to do similar work for clients but so far, no dataset was "big" enough to justify moving away from well established R libraries.

[1] https://github.com/haskell-servant/servant

[2] http://www.tweag.io/

[knucklesandwich]

This is such a trite criticism. This post isn't evangelizing the language, its describing coding styles of different haskell engineers using a simple toy problem (that happens to be a canonical algorithm for teaching recursion and FP) to make it somewhat comprehensible to a layman.

Every time I read a comment like this it reminds me how much fashion and an unsubstantiated cult of "viable for production" publicity steers the industry instead of curiosity and experimentation.

LMGHTFY: https://github.com/search?l=&o=desc&q=language%3AHaskell&ref...

[pka]

First google result: https://wiki.haskell.org/Haskell_in_industry

You'll probably recognize some companies, such as Facebook, Google, Microsoft.

[imakesnowflakes]

> I would like to see examples of the language actually doing something useful.

A Haskell program I wrote to find and match subtitle files for a particular release of the movie I have.

https://hackage.haskell.org/package/hastily

[mchaver]

Sounds like confirmation bias. You can find lots of code written in Haskell on GitHub. Try searching something there while adding "language:haskell".

Anecdata: Haskell pays my bills and I've never coded a factorial function at work.