chiroptical

{-# LANGUAGE BlockArguments #-}

module Main where

main :: IO ()
main = do
  babyShark
  do do do do do do babyShark
  do do do do do do babyShark
  do do do do do do babyShark

graninas

Design patterns in Haskell

This is a list of patterns. I'm collecting this list with an idea to write a book similar to the GoF book.

My patterns:

• Typed / Untyped pattern
• Typed Avatar pattern (see Hydra and Node)
  • Typed Options pattern (see EulerHS)
• Control Structure pattern (see CLI control structure in Hydra and similar in Node)

ChrisPenner

Optics By Example Cheat Sheets

The following are appendices from Optics By Example, a comprehensive guide to optics from beginner to advanced! If you like the content below, there's plenty more where that came from; pick up the book!

• Operators
• Composition Guide
• Substitution Guide
• Optical Constarints and Types

Operator Cheat Sheet

chshersh

{-# LANGUAGE DataKinds            #-}
{-# LANGUAGE FlexibleContexts     #-}
{-# LANGUAGE FlexibleInstances    #-}
{-# LANGUAGE InstanceSigs         #-}
{-# LANGUAGE KindSignatures       #-}
{-# LANGUAGE PolyKinds            #-}
{-# LANGUAGE Rank2Types           #-}
{-# LANGUAGE TypeFamilies         #-}
{-# LANGUAGE TypeOperators        #-}
{-# LANGUAGE UndecidableInstances #-}

chshersh

#!/usr/bin/env cabal
{- cabal:
build-depends:
  , base ^>= 4.12.0.0
  , comonad ^>= 5.0
  , pretty-simple ^>= 2.2
  , text
-}

{-# LANGUAGE OverloadedStrings #-}

chshersh

Legend:

• ➖ poor (impossible or very hard to achieve)
• ➕ good (possible but requires some dancing)
• ✔️ excellent (very easy to achieve/have)

PC stands for parser combinators and PG — parser generators.

Property	Generators	Combinators	Description
Power	✔️ LALR	➕ LL(∞)	PC can't handle left-recursive grammars (though, there's some article¹...).

chshersh

-- To run: 
--    cabal repl -b pretty-simple
--
-- Colorizing and pretty-printing ghci output
-- requires: pretty-simple
:set -interactive-print=Text.Pretty.Simple.pPrint

-- green bold lambdas and multiline mode
:set prompt      "\ESC[1;32mλ: \ESC[m"
:set prompt-cont "\ESC[1;32mλ| \ESC[m"

chshersh

{-# LANGUAGE PatternSynonyms #-}
{-# LANGUAGE RankNTypes      #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE ViewPatterns    #-}

-- | This module contains some approach for emulating array syntax from
-- imperative languages. The approach emulates only syntax, not efficiency.
-- Though if you like working with persistent arrays it may be good for you.
-- Also it's a fun exercise on lenses.

saurabhnanda

Attention

This page has been moved to http://www.vacationlabs.com/haskell-bounty-program

Haskell Internship Bounty Program

Here's the general idea:

• Solve a pre-defined problem (could be an open source contribution OR an internal tool) for a bounty (basically success-fee). Not looking at GSoC level funding or problems, but something that can be done in 1-2 weeks with a 50-250$ bounty.
• Supported by mentoring and general help over slack/IRC.

wh1tney

Gist

This is a quick tutorial explaining how to get a static website hosted on Heroku.

Why do this?

Heroku hosts apps on the internet, not static websites. To get it to run your static portfolio, personal blog, etc., you need to trick Heroku into thinking your website is a PHP app. This 6-step tutorial will teach you how.

Basic Assumptions