friedbrice

module Payments where

data Customer = Customer { name :: String, age :: Int } deriving (Eq, Ord, Show)

-- I know partial record fields is an anti-pattern, but who's counting?
data Payment
  = Cash { customer :: Customer, amount :: Double }
  | Credit { customer :: Customer, amount :: Double, cardNumber :: Int }
  | Check { customer :: Customer, amount :: Double, routingNumber :: Int, accountNumber :: Int }
  deriving (Eq, Ord, Show)

arosien

Variance: OOP vs. FP

TODO: introduction

Note: the examples below use the following algebraic data type:

sealed trait Shape
case class Circle(radius: Double) extends Shape
case class Rectangle(height: Double, width: Double) extends Shape

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

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

lelandbatey

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results