noxasaxon

Learning Rust

Getting Started + Installation | Cheat Sheet

Table of Contents

1. How Do I Start Learning Rust?!
2. Ok, I Think I Know The Basics But How Do I Get Better?!
3. Rustlang Tooling
4. Helpful References Throughout Your Journey
5. The Rust Community
6. Recommended (but not free) Books & Courses

oli-kitty

sealed trait Expr

case class Const(d: Double) extends Expr

case class Var(a: String) extends Expr

case class Times(l: Expr, r: Expr) extends Expr

case class Plus(l: Expr, r: Expr) extends Expr

johnynek

// unfortunately
// opaque type Fix[F[_]] = F[Fix[F]]
// won't work (no recursion in opaque type), but this implementation is safe, but scary due to asInstanceOf
object FixImpl {
  type Fix[F[_]]

  inline def fix[F[_]](f: F[Fix[F]]): Fix[F] = f.asInstanceOf[Fix[F]]
  inline def unfix[F[_]](f: Fix[F]): F[Fix[F]] = f.asInstanceOf[F[Fix[F]]]
}

alexandredantas

import scalaz.std.list._
import zio.IO
import scalaz.{ Applicative, Monad }

import scala.util.Try

package object types{
  type ThrowableSafeResult[+T] = IO[Throwable, T]

  implicit val ioMonadInstance: Monad[ThrowableSafeResult] = new Monad[ThrowableSafeResult] {

douglascayers

# This script uses the GitHub Labels REST API
# https://developer.github.com/v3/issues/labels/

# Provide a personal access token that can
# access the source and target repositories.
# This is how you authorize with the GitHub API.
# https://help.github.com/en/articles/creating-a-personal-access-token-for-the-command-line
GH_TOKEN="YOUR_TOKEN"

# If you use GitHub Enterprise, change this to "https://<your_domain>/api/v3"

douglascayers

/**
 * Inspired by @MoOx original script: https://gist.github.com/MoOx/93c2853fee760f42d97f
 * Adds file download per @micalevisk https://gist.github.com/MoOx/93c2853fee760f42d97f#gistcomment-2660220
 * 
 * Changes include:
 *  - Get the description from the `title` attribute instead of `aria-label` (doesn't exist anymore)
 *  - Use style.backgroundColor and parse the rgb(...) to hex (rather than regex parsing of 'style' string)
 *  - Downloads labels to a JSON file named after the webpage to know which GitHub repo they came from.
 * 
 * Last tested 2019-July-27:

alexandredantas

import zio.clock.Clock
import zio.console.Console
import zio.system.System
import zio.random.Random
import zio.blocking.Blocking
import com.typesafe.config.Config
import zio.Task
import com.typesafe.config.ConfigFactory
import scala.collection.JavaConverters

adrianobrito

const charMap = {
    'á' : "'a",
    'Á' : 'A',
    'ã' : 'a]   ',
    'Ã' : 'A]',
    'â' : '^a',
    'Â' : '^A',
    'à' : '`a',
    'À' : "`A",
    'é' : "'e",

gustavompo

[{url: "https://emoji.slack-edge.com/T6CU2169Z/100sual/b3a1531ff45f2acd.jpg", name: ":100sual:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/1_don%2527t_pick_up_the_phone/8dd1f635352780e8.png", name: ":1_don't_pick_up_the_phone:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/1hokage/9e66cda3a2ecf310.jpg", name: ":1hokage:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/2_don%2527t_let_him_in/eb898e174fa62821.png", name: ":2_don't_let_him_in:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/2hokage/63f4935ed5608b8c.gif", name: ":2hokage:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/3_don%2527t_be_his_friend/68b9721a15ed8aeb.png", name: ":3_don't_be_his_friend:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/3hokage/765b9b0f9d994981.jpg", name: ":3hokage:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/4hokage/39a0745cfb994d6c.jpg", name: ":4hokage:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/5hokage/0e9dcea089de5b8b.jpg", name: ":5hokage:"}
,{url: "https://emoji.slack-edge.com/T6CU2169Z/6hokag

noelwelsh

The Reader Monad

The reader monad is one solution to "dependency injection". This document shows how we might discover the reader monad when we attempt to solve this problem.

Dependency Injection

Our working definition of the dependency injection problem will be this: we have a method or function that takes certain parameters that we don't want to specify every time we call it. For example, we might have a function that gets a user given an ID and also requires a database connection.

def getUser(db: DbConnection, id: Id): User =