xgrommx

A series of reading lists mostly related to functional programming.

xgrommx

{-# LANGUAGE DeriveFunctor       #-}
{-# LANGUAGE FlexibleInstances   #-}
{-# LANGUAGE TypeFamilies        #-}
{-# LANGUAGE GADTs               #-}
{-# LANGUAGE LambdaCase          #-}

import           Data.Functor.Foldable hiding (Foldable)
import qualified Data.Functor.Foldable as Functor
import           Data.Traversable
import qualified Data.Map as Map

xgrommx

{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE FlexibleContexts #-}

module Data.Functor.Foldable.Monadic
  ( cataM
  , anaM
  , futuM
  ) where

import Protolude

xgrommx

{-# LANGUAGE  NoImplicitPrelude #-}
module Origami where

import Prelude
    (
      (.)
    , (-)
    , (*)
    , (++)
    , ($)

xgrommx

{-# LANGUAGE
  UndecidableInstances, RankNTypes, TypeOperators, TypeFamilies,
  StandaloneDeriving, DataKinds, PolyKinds, DeriveFunctor, DeriveFoldable,
  DeriveTraversable, LambdaCase, PatternSynonyms, TemplateHaskell #-}

import Control.Monad
import Control.Applicative
import Data.Singletons.TH

xgrommx

Advanced Functional Programming with Scala - Notes

Copyright © 2017 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

xgrommx

{-# LANGUAGE NoMonomorphismRestriction #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE TypeFamilies #-}
import Data.Functor.Foldable
import Data.Maybe
import qualified Data.Map as M
listCata :: ListCata a b
listCata = cata

reduceBy :: Ord k => ListAlgebra t b -> (t -> k) -> [t] -> M.Map k b

xgrommx

Learn you a Haskell - In a nutshell

This is a summary of the "Learn You A Haskell" online book under http://learnyouahaskell.com/chapters.

---

1. Introduction

• Haskell is a functional programming language.

xgrommx

/* 
Split an array into chunks and return an array
of these chunks.

This will *not* preserve array keys.

*/
Array.prototype.chunk = function(groupsize){
    var sets = [], chunks, i = 0;
    chunks = this.length / groupsize;

xgrommx

// Free monad based thread simulation and FRP constructs written in JavaScript


// First, we need some way to express lazy values and actions.
// We can use zero-argument functions for this purpose: call the function and
// you get the value. We also need to compose lazy values/actions. For that
// we have bindLazy function. Lazy values are not expected to be pure
// in this program: evaluating a lazy value/action at different times can produce
// a different value.