ogazitt

package auth

import (
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"net"
	"net/http"
	"net/url"

fdietze

What is a Monad?

A Monad is something that supports flatMap.

Examples: Option, List, Future

flatMap is the same as >>= in Haskell.

• http://adit.io/posts/2013-04-17-functors,_applicatives,_and_monads_in_pictures.html
• https://typelevel.org/cats/typeclasses/functor.html

fdietze

Jitpack

https://jitpack.io

For testing purposes, the easiest way to go is jitpack:

resolvers += "jitpack" at "https://jitpack.io"
libraryDependencies += "com.github.User" % "Repo" % "Tag"

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

garybernhardt

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

rmtsrc

PostgreSQL JSON Cheatsheet

Using JSON in Postgres by example.

Quick setup via Docker

1. Download and install: Docker Toolbox
2. Open Docker Quickstart Terminal
3. Start a new postgres container:
   docker run --name my-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres

kiritsuku

import scala.io.StdIn
import scala.util._

import akka.actor._
import akka.stream._
import akka.stream.scaladsl._
import akka.stream.stage._
import akka.util._

object ComplexTcpClient extends App {

brianwawok

// this works in play 2.4 with the 1.9.29 version of async http client 

  def securePostMultipart(requestPath: String, etsyToken: RequestToken,
                          fileName: String, file: File, fileMimeType: String,
                          stringParts: (String, String)*): Future[WSResponse] = {
                            
    val fullUrl = "http://foo/bar/zar"

    val parts : List[Part] = List(
      new FilePart(fileName, file, fileMimeType),

cb372

Category theory jargon cheat sheet

A primer/refresher on the category theory concepts that most commonly crop up in conversations about Scala or FP. (Because it's embarassing when I forget this stuff!)

I'll be assuming Scalaz imports in code samples, and some of the code may be pseudo-Scala.

Functor

A functor is something that supports map.

carymrobbins

  /**
   * Pretty prints a Scala value similar to its source represention.
   * Particularly useful for case classes.
   * @param a - The value to pretty print.
   * @param indentSize - Number of spaces for each indent.
   * @param maxElementWidth - Largest element size before wrapping.
   * @param depth - Initial depth to pretty print indents.
   * @return
   */
  private def prettyPrint(a: Any, indentSize: Int = 2, maxElementWidth: Int = 30, depth: Int = 0): String = {