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@Icelandjack
Icelandjack / Yoneda_II.markdown
Last active April 8, 2024 11:08
Yoneda Intuition from Humble Beginnings

(previous Yoneda blog) (reddit) (twitter)

Yoneda Intuition from Humble Beginnings

Let's explore the Yoneda lemma. You don't need to be an advanced Haskeller to understand this. In fact I claim you will understand the first section fine if you're comfortable with map/fmap and id.

I am not out to motivate it, but we will explore Yoneda at the level of terms and at the level of types.

@mohanpedala
mohanpedala / bash_strict_mode.md
Last active June 17, 2024 23:44
set -e, -u, -o, -x pipefail explanation
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
import Control.Monad.IO.Class
import Control.Monad.Trans.Class
import Prelude hiding (log)
--------------------------------------------------------------------------------
-- The API for cloud files.
class Monad m => MonadCloud m where
saveFile :: Path -> Bytes -> m ()
@runarorama
runarorama / gist:a8fab38e473fafa0921d
Last active April 13, 2021 22:28
Compositional application architecture with reasonably priced monads
sealed trait Interact[A]
case class Ask(prompt: String)
extends Interact[String]
case class Tell(msg: String)
extends Interact[Unit]
trait Monad[M[_]] {
def pure[A](a: A): M[A]
@gcatlin
gcatlin / gist:1847248
Created February 16, 2012 19:43
Install specific version of Homebrew formula
brew update
brew versions FORMULA
cd `brew --prefix`
git checkout HASH Library/Formula/FORMULA.rb # use output of "brew versions"
brew install FORMULA
brew switch FORMULA VERSION
git checkout -- Library/Formula/FORMULA.rb # reset formula
## Example: Using Subversion 1.6.17
#