Marco Yuen marcoy

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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.

ABOUT

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Keybase proof

I hereby claim:

I am marcoy on github.
I am marcoy (https://keybase.io/marcoy) on keybase.
I have a public key ASAcnRu39hfDGl7tsGySaYjoxrSPJCSFzkNfdEWRXy7Epgo

To claim this, I am signing this object:

	# vim: ts=4 sw=4
	# Initialize completion
	# autoload -Uz compinit
	# compinit -d "$HOME/.zcompdump"
	zstyle ':completion::complete:*' use-cache on
	zstyle ':completion::complete:*' cache-path "$HOME/.zcache"

	# Enable approximate completions
	zstyle ':completion:*' completer _complete _ignored _approximate
	zstyle -e ':completion::approximate:' max-errors 'reply=($((($#PREFIX+$#SUFFIX)/3)) numeric)'

	// Use this with `amm -p AmmPlay.sc`
	//
	// interp.configureCompiler(_.settings.YpartialUnification.value = true)
	interp.configureCompiler(_.settings.YmacroAnnotations.value = true)
	interp.configureCompiler(_.settings.feature.value = true)
	interp.configureCompiler(_.settings.unchecked.value = true)
	interp.configureCompiler(_.settings.deprecation.value = true)
	interp.configureCompiler(_.settings.language.tryToSet(List("higherKinds", "postfixOps")))
	// Check settings inside ammonite `repl.compiler.settings`

	// Use this with `amm -p Troops.sc`
	interp.repositories() ++= List(
	coursier.Cache.ivy2Cache
	)

	@

	interp.configureCompiler(_.settings.YpartialUnification.value = true)
	interp.configureCompiler(_.settings.feature.value = true)
	interp.configureCompiler(_.settings.unchecked.value = true)

	set noautofocus
	set nosmoothscroll

	let blacklists = ["https://mail.google.com/", "://mail.google.com/*"]
	let mapleader = ","

	" Normal mode: gna
	let qmark a = ['http://www.reddit.com/r/clojure', 'http://www.reddit.com/r/haskell', 'http://www.reddit.com/r/java', 'https://news.ycombinator.com', 'https://lobste.rs/']

	let searchengine hayoo = 'http://hayoo.fh-wedel.de/?query=%s'

	:set prompt "\ESC[1;31m%s\n\ESC[0;33mλ> \ESC[m"

	let ghciEscapeShellArg arg = "'" ++ concatMap (\x -> if x == '\'' then "'\"'\"'" else [x]) arg ++ "'"
	:def! hoogle \str -> return $ ":! hoogle --count=15 \"" ++ str ++ "\""
	:def! search return . (":! hoogle --color --count=20 " ++) . ghciEscapeShellArg
	:def! doc return . (":! hoogle --info " ++) . ghciEscapeShellArg

	;; http://stackoverflow.com/questions/18779296/clojure-core-async-any-way-to-control-number-of-threads-in-that-go-thread
	(ns sandbox
	(:require [clojure.core.async.impl.concurrent :as conc]
	[clojure.core.async.impl.exec.threadpool :as tp]
	[clojure.core.async :as async]))

	(defonce my-executor
	(java.util.concurrent.Executors/newFixedThreadPool
	1
	(conc/counted-thread-factory "my-async-dispatch-%d" true)))