runarorama

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]

paf31

This blog post series has moved here.

You might also be interested in the 2016 version.

milessabin

// An ADT+shapeless as a drop-in replacement for a standard Scala Enumeration.
//
// First the unsafe standard Scala Enumeration ...
//
object ScalaEnumDemo extends App {
  // Example from scala.Enumeration scaladoc. Terse ...
  object WeekDay extends Enumeration {
    type WeekDay = Value
    val Mon, Tue, Wed, Thu, Fri, Sat, Sun = Value
  }

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

gabydd

[keys.normal]
C-f = [":new", ":insert-output lf-pick", "split_selection_on_newline", "goto_file", "goto_last_modification", "goto_last_modified_file", ":buffer-close!", ":theme nord", ":theme default"]
# replace the default after theme with the theme you use
# open 1 with the open command (l and <left> to open) or more with (<space> to select) then quit
# all opened files will be opened in helix