Hacker News Reader

koloronon Modern Functional Programming: The Onion Architecture

Here are two blog posts on free monads that should be accessible for people who understand what a monad is and are able to read Haskell:

http://www.haskellforall.com/2012/06/you-could-have-invented...

http://www.haskellforall.com/2012/07/purify-code-using-free-...

koloronon Show HN: Dependency CI – Continuous testing for your dependencies

Yeah, someone please write reverse-dependency-ci! :)

koloronon Make for hipsters

> but it's still the best at what it does.

If "what it does" means "build complex software projects" I think your claim is rather debatable.

GHC is currently switching away from make after having already overhauled its make-based build system two times:

http://research.microsoft.com/en-us/um/people/simonpj/papers...

koloronon Microsoft announces major commitment to Apache Spark

Haskell: https://github.com/tweag/sparkle

koloronon Programming from the Ground Up [pdf]

Hah, just today I started to read "Haskell programming from first principles"[1] which also targets non-programmers but builds on lambda calculus instead of assembly.

Would anyone actually recommend to a beginner to start learn assembly first?

[1]http://haskellbook.com/

koloronon Amazon open-sources Ion – a binary and text interchangable, typed JSON-superset

Nearly the same question was recently asked in r/haskell:

https://www.reddit.com/r/haskell/comments/4fhuw3/json_for_ad...

koloronon Building a Better Custom Haskell Prelude

Even better with mapMaybe:

    map transform . mapMaybe safeHead

koloronon Building a Better Custom Haskell Prelude

The project has existed only since last summer.

koloronon Building a Better Custom Haskell Prelude

If you're still using string types for pathnames you may want to check out the path and path-io packages. The path package defines a Path type parameterized by its locality (absolute or relative) and type (pointing at a file or a directory).

Especially the distinction between relative and absolute paths adds a nice safety layer.

koloronon Building a Better Custom Haskell Prelude

mcbuilder has already mentioned it, but I really want to emphasize that dependency management in Haskell is an entirely different story now with stack.

koloronon Object-Oriented Programming is Garbage: 3800 SLOC example [video]

IMO, the difference in readability has little to do with the difference between OOP and FP. What's important is the expressiveness of the language.

So Ruby can be very easy to read because you can simply keep appending methods to the right.

In Haskell you can do the same, only you'll prepend functions on the left, so you end up reading expressions from right to left:

    (intercalate ", " . map show . Map.elems) myMap

What I find really hard to read, are expressions where the direction of the data flow changes, something that often happens to me in Java:

    Streams.takeWhile(list.stream().map(e -> f(e)), e -> e.isNeeded())

koloronon Golang: channels are not enough

> It doesn't want to be Haskell or Lisp, those languages can be very hard to use and maintain for junior developers in large teams.

Can you expand a bit on the difficulties that these junior developers had with Haskell?

koloronon The Joy and Agony of Haskell in Production

I find ghcid very useful. It reloads your code automatically when it detects a filechange.

https://github.com/ndmitchell/ghcid http://neilmitchell.blogspot.de/2014/09/ghcid-new-ghci-based...

koloronon Kotlin 1.0 Released: Pragmatic Language for JVM and Android

Since GHC-7.10, the minimal complete definition for a Monad instance has been (>>=) (bind) only. So you can simply move the old definition for "return" into the Applicative instance as "pure" and you're good.

koloronon Kotlin 1.0 Released: Pragmatic Language for JVM and Android

How does Maven compare to Haskell's Stack in your opinion?

koloronon Kotlin 1.0 Released: Pragmatic Language for JVM and Android

Didn't downvote, just FYI: Haskell's Applicative is a superclass of Monad now.

koloronon Rust vs. C++: Fine-grained Performance

Can you share some links?

koloronon Imogen Heap releases single on Ethereum-based Mycelia

My favorite song by her: https://www.youtube.com/watch?v=eAKh26bfkpw

Beautiful usage of a vocoder.

Yes, I know it's OT…

koloronon 400 days of Go

Haskell has a pretty cool new dependency management tool called stack (https://github.com/commercialhaskell/stack).

It's based on the curated package server https://stackage.org which server sets of packages that are tested for compatibility.

koloronon What can I only do in Erlang?

How does Haskell compare to Erlang regarding these features?

koloronon Q – A Data Language

That's at least the third programming language named Q:

https://en.wikipedia.org/wiki/Q_(programming_language_from_K...

https://en.wikipedia.org/wiki/Q_(equational_programming_lang...

koloronon Show HN: A simple IP address API

"postal" and "loc" are a bit off in my case. My true location is about 6km away from "loc".

koloronon The Workman Keyboard Layout

Symbols are in the same class as uppercase letters in the Neo layout. They are easily accessible by pressing the caps lock key.

Hover your mouse over "Ebene 3" here: http://neo-layout.org/

koloronon The Workman Keyboard Layout

I'm a happy user of the Neo layout. It's very different from QWERTY (or rather German QWERTZ) but optimised for English and German bi- and trigrams as well as programming.

Read about it here: http://en.wikipedia.org/wiki/Keyboard_layout#Neo

Or take a good look at its multilevel layout here: http://neo-layout.org/ ("Ebene 3" is especially interesting for programmers…)

koloronon What is new in IPython 1.0

AFAIK any shell command preceded by a "!" works just as you would it expect it to work in your shell.

koloronon Vim as a Python IDE, or Python IDE as Vim

I'm currently looking to adapt vim for Python development. What are the other plugins that you use or would you possibly even share your .vimrc?