Issue 168 2019-07-18

Welcome to another issue of Haskell Weekly! Haskell is a safe, purely functional programming language with a fast, concurrent runtime. This is a weekly summary of what’s going on in its community.

Featured

Building and Debugging FRP with CodeWorld and Reflex by Chris Smith

I’ll show you how the system has changed, and what you can do now that you couldn’t do before.
Evaluation of function calls in Haskell by Laszlo Treszkai

In this post I analyze the runtime differences between point-free and pointful definitions.
Fancy types for CSV library by Oleg Grenrus

This blog post is a thought on a following question: Can we make Cassava (= CSV) stuff a bit safer using fancy types?
Global Implicit Parameters by Csongor Kiss

Unlike type classes, implicit parameters are bound locally. But what if we want to bind one in the global scope?
Haskell-y Ever After: Summer Tales for Every Full-stack Developer (Part One) by Andika Demas Riyandi

A Google Summer of Code’s student story about implementing Haskell on the Hackage Matrix Builder’s frontend application using Functional Reactive Programming approach.
How I Intend to Help Steer GHC by Sandy Maguire

Yesterday I was (somewhat surprisingly) brought on as a new member of the GHC steering committee.
HSoC — Hadrian Optimisation: First GHC Contribution (Update 4) by James Foster

Everyone should now get a few minutes knocked off their GHC build times (with Hadrian anyway), with maybe a bit more or less depending on your hardware and build flavour.
Open Sum Types in Haskell with world-peace by Dennis Gosnell

world-peace is not as fast as some other libraries providing open sum types, but it does have much better documentation than other libraries.
Revelations from repetition: Source code headers in Haskell and Python by Simeon Carstens and Matthias Meschede

How do languages differ in their boilerplate content? Is it only the content of the boilerplate that changes, or also its quantity?
Show and Tell: Game: Water-Wars by FailWhaleBrigade

The game idea was to clone “Towerfall”, a fast paced multiplayer shooting/platforming game.

Jobs

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In brief

Package of the week

This week’s package of the week is ghc-source-gen, a library for generating Haskell source code. It uses the ghc library to support recent language extensions, and provides a simple, consistent interface across several major versions of GHC.

Call for participation

ormolu: Constructor ticks are removed from operator constructors, leading to warnings with -Wall

Events

North America

2019-07-18 in Raleigh, NC, USA by Raleigh Haskell Meetup: (hack . yack)
2019-07-18 in San Diego, CA, USA by San Diego Functional Programmers: July Meetup - Haskell: From 30,000 Feet
2019-07-20 in Boston, MA, USA by Weekly Functional Programming Meetup: Hang out + short talk (topic not yet announced)
2019-07-20 in Bellevue, WA, USA by Seattle Area Haskell Users’ Group: General discussion
2019-07-20 in Berkeley, CA by Code Self Study: Open Programming Session (Saturday Afternoon)
2019-07-21 in Des Moines, IA, USA by Des Moines Haskell Study Group: (South DSM) Week 8. Review ch. 1 - 12 plus 13-14
2019-07-22 in Irvine, CA by Orange Combinator - Functional Programming In OC: The Weekly Function
2019-07-22 in Chicago, IL, USA by Chicago Elm: Chicago Elm - July Code Night
2019-07-23 in Middleton, WI, USA by Madhackers: Hack Night in Middleton
2019-07-23 in Philadelphia, PA, USA by Elm Philadelphia: Elm Show & Tell
2019-07-23 in San Francisco, CA, USA by Erlang & Elixir SF: Wrestling Time and Date & Managing Registry!
2019-07-24 in Berkeley, CA by Code Self Study: Open Programming Session (Wednesday, Berkeley)
2019-07-24 in Portland, OR, USA by Portland Functional Programming Study Group: PDX Func Theory Track - Lambda Calculus
2019-07-25 in Raleigh, NC, USA by Raleigh Haskell Meetup: (hack . yack)
2019-07-25 in Las Vegas, NV, USA by Las Vegas Functional Programming User Group: Functional Programming Meetup
2019-07-25 in Chicago, IL, USA by The Project Euler Sprint: Project Euler Sprint
2019-07-25 in Bellevue, WA, USA by Fun(c)tional Programming Group: Functional programming in Scala with Rafa Paradela

Europe

2019-07-19 in Dortmund, Germany by Elm-user-group-Dortmund: Hello World - second installation
2019-07-22 in Karlsruhe, Germany by Karlsruhe Haskell Meetup: Haskell Monday
2019-07-22 in London, United Kingdom by Skills Matter - xMatters Keynote Series - Developer Events: Skills Matter Open House July
2019-07-22 in London EC2, United Kingdom by Skills Matter - xMatters Keynote Series - Developer Events: Keynote by Portia Tung
2019-07-23 in London EC2, United Kingdom by Skills Matter - xMatters Keynote Series - Developer Events: Emily Jiang- On Stage Hacking: Build 12-Factor Microservices in an Hour
2019-07-24 in Berlin, Germany by Berlin Haskell Users Group: Haskell Wednesday
2019-07-24 in Stuttgart, Germany by Cardano Blockchain Stuttgart: Cardano Stammtisch no.4
2019-07-24 in Leipzig, Germany by Funktionaler Stammtisch Leipzig: “Funktionaler Stammtisch” Clojure, Elm, Haskell, Scala and Co…
2019-07-25 in München, Germany by Elm |> Munich: Monthly Elm Meeting #17
2019-07-25 in Bucharest, Romania by Bucharest FP: Bucharest FP #59: A Simple HTTP Server in Haskell
2019-07-25 in Zürich, Switzerland by HaskellerZ: Mauro Bieg - pandoc: converting documents for fun and profit!
2019-07-25 in London EC2, United Kingdom by Skills Matter - xMatters Keynote Series - Developer Events: Keynote by Angela Yu on Why I’m Building My Next App in Flutter

Asia

2019-07-18 in Noida, India by Reactive Application Programmers in Delhi NCR: [Webinar- 18 July]: Draw a line between Http/1.1 and Http/2 Client

Africa

2019-07-20 in Nairobi, Kenya by Nairobi JVM: Building Scalable Data Pipelines with Kafka and Apache Spark

Oceania

2019-07-25 in Melbourne, Australia by Melbourne Haskell Users Group: Melbourne Haskell Users Group Meetup