Alissa Pajer alissapajer

alissapajer / gist:50c912d739346c1f00dd

Last active April 1, 2016 06:34

Contravariant and Covariant Functors and Variance of Types over their Type Parameters

	/**
	* Exercises explaining covariant and contravariant functors.
	*
	* Additionally exercises explaining variance of types over their type parameters.
	*
	* Implement the `???` functions. Are all implementable?
	*/

	trait Functors {
	/**

alissapajer / Why ConcurrentHashMap

Last active August 29, 2015 13:58

	import java.util.concurrent.ConcurrentHashMap

	object Why {
	val data = new ConcurrentHashMap[Int, String]

	def update(int: Int, str: String): Unit = {
	data.put(int, str)
	}
	}

alissapajer / IntermHaskell.hs

Created February 9, 2014 11:54 — forked from 23Skidoo/IntermHaskell.hs

	-- https://haskell.fpcomplete.com/user/DanBurton/20-intermediate-exercises
	-- Originally from http://blog.tmorris.net/posts/20-intermediate-haskell-exercises/

	class Fluffy f where
	furry :: (a -> b) -> f a -> f b

	-- Exercise 1
	-- Relative Difficulty: 1
	instance Fluffy [] where
	furry = fmap

alissapajer / packinglist

Created October 8, 2012 03:36

Rainier packing list!