IanColdwater

Mute these words in your settings here: https://twitter.com/settings/muted_keywords

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sam95

Apache Kafka is a highly-scalable publish-subscribe messaging system that can serve as the data backbone in distributed applications. With Kafka’s Producer-Consumer model it becomes easy to implement multiple data consumers that do live monitoring as well persistent data storage for later analysis. You can assume that RabbitMQ is similar to Kafka, You do get an option for message-sending or Broadcasting. The installation process for OSX is as below.

1. The best way to install the latest version of the Kafka server on OS X and to keep it up to date is via Homebrew.

    brew search kafka
    brew install kafka 
   

2. The above commands will install a dependency called zookeeper which is required to run kafka. Start the zookeeper service.

zkserver start

pathikrit

Libraries

• Web Server: Play (framework) or http4s (library)
• Actors: akka
• Asynchronous Programming: monix (for tasks, reactors, observables, scheduler etc)
• Authentication: Silhouette
• Authorization: Deadbolt
• Command-line option parsing: case-app
• CSV Parsing: kantan.csv
• DB: doobie (for PostgreSQL)

samsheffield

// Unity C# Cheat Sheet
// I made these examples for students with prior exerience working with C# and Unity. 
// Too much? Try Unity's very good tutorials to get up to speed: https://unity3d.com/learn/tutorials/topics/scripting

wvengen

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

manjuraj

//
// Validation[E, A] represents either:
// - Success[A]
// - Failure[E]
//
// Isomporphic to scala.Either[E, A] and scalaz.\/[E, A]
//
// Unlike \/[E, A], Validation is not a Monad, but an Applicative
// Functor. So if you want to use it as a Monad you can convert back
// and forth using the `validation` and `disjunction` method

NicolasT

# Deriving Typeclass Instances using Typed Holes

> module Conc where
> import Control.Applicative

We're presented with the following structure:

> data Concurrent a = Concurrent ((a -> Action) -> Action)
> data Action = Atom (IO Action)
>             | Fork Action Action

chrisdone

Typing Haskell in Haskell

MARK P. JONES

Pacific Software Research Center

Department of Computer Science and Engineering

Oregon Graduate Institute of Science and Technology

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.

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tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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