\ Haskell Weekly \/\/ Issue 63 https://haskellweekly.news/issues/63.html Welcome to another issue of Haskell Weekly! Haskell is a purely functional programming language that focuses on robustness, concision, and correctness. This is a weekly summary of what's going on in its community. ## Featured ## - GHC 8.2.1 release candidate 3 available https://mail.haskell.org/pipermail/ghc-devs/2017-July/014364.html
This release candidate fixes a number of regressions from 8.0.2 found in release candidate 2, as well as a major correctness bug present in several previous GHC major releases. Users taking advantage of parallelism in their programs will be strongly encouraged to upgrade to 8.2.1 once it is released.
Editor's note: Use this stack.yaml to test GHC 8.2.1-rc3 with Stack. https://gist.github.com/tfausak/623d283cfe7a338bcbfca56ddfec0ecd/cc31f363737... - Stack's new extensible snapshots https://www.fpcomplete.com/blog/2017/07/stacks-new-extensible-snapshots
There is a collection of features in Stack that have been added in bit by bit, as opposed to being designed into a cohesive whole from the start. The features work, but could be a bit better. We've known for a while that, instead of putting in place strategic fixes, a more general refactoring of the core dependency management logic was in order.
- ZuriHac 2017 https://www.youtube.com/playlist?list=PLOvRW_utVPVkoZ5GuodkejFU8MiH6_SB7 Videos of the Haskell keynotes from ZuriHac, the Zurich Haskell hackathon. Includes presentations from Edward Kmett, Stephen Diehl, Simon Thompson, Neil Mitchell, and Julie Moronuki. - Front Row is hiring a senior backend Haskell engineer https://frontrow.workable.com/j/463B843754
Come change how 6.5+ million K-12 US students learn Math, Language Arts, Social Studies and more. Use data, advanced type systems, great product design and deep pedagogy to change lives.
- Iterators and streams in Rust and Haskell https://www.fpcomplete.com/blog/2017/07/iterators-streams-rust-haskell
Real streaming data is handled at the library level in Haskell, with many different options available. Rust does things differently: it bakes in a concept called iterators not only with the standard library, but the language itself: `for` loops are built-in syntax for iterators.
- Introducing Vaultenv: Keeping your secrets secure with Vault and Haskell https://tech.channable.com/posts/2017-07-06-introducing-vaultenv-keeping-you...
We're pleased to announce our first bit of open source code. It is a CLI utility that fetches secrets from the HashiCorp Vault secret store. It makes secrets available using environment variables to a process of your choosing.
- Danger and HLint http://allocinit.io/haskell/danger-and-hlint/
Danger is a Ruby gem that you can use on your continuous integration process to automate code reviews. Danger can automatically go through the code in a an open pull request and check if it respects the rules your team and you have established.
- Reader monad part 2 https://medium.com/@jonathangfischoff/monad-reader-part-2-d812dda1d03e
In part 1 I went over the basics of the reader monad. In this post I'll cover some more advanced topics and alternatives to the reader monad.
- Encoding objects https://www.schoolofhaskell.com/user/fumieval/encoding-objects
Objects can be thought of as Mealy machines of effects, and their Haskell encoding is actually straightforward. This novel building block might be too strong to use everyday, but I'm pretty sure there are places where this abstraction fits well, like game programming.
- Playing match maker https://mmhaskell.com/blog/2017/7/10/playing-match-maker
So at this point, are we condemned to choose between a fast inaccurate algorithm and a correct but slow one? In this case the answer is no! This problem is actually best solved by using a graph algorithm!
## Package of the week ##
This week's package of the week is Solga, a library for easily
specifying web APIs and implementing them in a type-safe way.
https://www.stackage.org/lts-8.22/package/solga-0.1.0.2
## Call for participation ##
Are you interested in contributing to open-source Haskell projects but
not sure where to start? Here are some tasks from the Haskell community
for you to pick and get started!
- aeson: Hindent?
https://github.com/bos/aeson/issues/527
- cabal: Print out more information about the effective configuration
when you build
https://github.com/haskell/cabal/issues/3945
- esqueleto: Make examples for the README buildable
https://github.com/bitemyapp/esqueleto/issues/4
- miso: phantomjs2 fails to build on OSX
https://github.com/dmjio/miso/issues/160
- servant: BasicAuthentication has no documentation for client-side use
https://github.com/haskell-servant/servant/issues/752
- stack: `stack new` can't be pointed at an intranet site
https://github.com/commercialhaskell/stack/issues/2804
- text: Add tshow function
https://github.com/bos/text/issues/183
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