melvic-ybanez

What I Didn't Know about Functional Programming until 2020

1. Programming using a series of transformations and aggregations, something I've been doing for years, is known as programming in the map/reduce style.
2. The more abstract the type is, the greater its cardinality, and the smaller the set of operations it supports. So make use of universal quantifiers, particularly by implementing fully parametric functions. They guide you on how to implement their term-level definitions by narrowing down the number of possible implementations. In other words, the type system of Scala (or Haskell, for that matter) is not only great for capturing compile-time errors, but is also capable of leading you to the correct solution.
3. You can encode union types by combining different Scala features such as type constructors, subtyping and implicits, and by taking advantage of the Curry-Howard Isomorphism and De Morgan's Laws for neg

sir-wabbit

Preliminaries

type Void <: Nothing
type ¬[-A] = A => Void
type ¬¬[+A] = ¬[¬[A]]
type ⋁[+A, +B] = Either[A, B]
type ⋀[+A, +B] = Tuple2[A, B]

mpneuried

# import config.
# You can change the default config with `make cnf="config_special.env" build`
cnf ?= config.env
include $(cnf)
export $(shell sed 's/=.*//' $(cnf))

# import deploy config
# You can change the default deploy config with `make cnf="deploy_special.env" release`
dpl ?= deploy.env
include $(dpl)

jdegoes

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 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

kennwhite

Launch_Alpine_Linux_3.3.x_on_AWS.md

Create a local VM of Alpine Linux, eg: https://gist.github.com/kennwhite/959d47a77070d365ad60

• On your workstation open a terminal and create a new ssh keypair:

  ssh-keygen -t rsa -b 4096 -C "[email protected]"

  • Set a meaningful keypair base file name when prompted, eg: alpine-test