sentenza

// IO: A Monad for side-effects.
import $ivy.`org.typelevel::cats-effect:1.3.1`

import cats.effect.IO
import scala.concurrent.ExecutionContext

implicit val IOTimer = IO.timer(ExecutionContext.global)
implicit val IOShift = IO.contextShift(ExecutionContext.global)
// ----------------------------------------------

sentenza

Installing and configuring Powerline-style command line tools for developers (OSX)

Intro:

For every developer, terminal is their weapon, so why don't you customize it to become a powerful, and a beautiful weapon?

Powerline style refers to a terminal style that helps developer to keep track of their workflow easily, allows them to have perfect visual on current directories and new changes. It is also git recognizable, and failure detector that will help your development process becomes more interact and much faster.

In this guideline, I will introduce you with 2 smart shells: Zsh and Fishshell. Both are perfect for the development jobs due to its rich of resources, and user-friendly.

Note:

sentenza

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

sentenza

package com.codersbistro.controllers

import akka.actor.ActorSystem
import akka.event.Logging
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import akka.http.scaladsl.model.{StatusCodes}
import akka.http.scaladsl.server.Route
import akka.http.scaladsl.server.Directives._
import com.codersbistro.controllers.EmployeeController.QueryEmployee
import com.codersbistro.repository.EmployeeRepository

sentenza

Comprehensive Introduction to @ngrx/store

By: @BTroncone

Also check out my lesson @ngrx/store in 10 minutes on egghead.io!

Update: Non-middleware examples have been updated to ngrx/store v2. More coming soon!

Also see this SO answer.

Table of Contents

sentenza

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.

---

sentenza

object Algebra {

  // Build up increasingly complex algebras
  trait Magma[T] {
    def add(x : T, y : T) : T
  }

  trait Monoid[T] extends Magma[T] {
    def zero : T
  }

sentenza

SELECT 
  SUBSTRING_INDEX(number, '.', 1) AS FIRST_INT, 
  SUBSTRING_INDEX(SUBSTRING_INDEX(number, '.', 2), '.', -1) AS SECOND_INT, 
  SUBSTRING_INDEX(number, '.', -1) AS THIRD_INT,
  number as VERSION, 
  description as TITLE 
FROM _version 
ORDER BY
  LENGTH(SUBSTRING_INDEX(number, '.', 1)) DESC,
  SUBSTRING_INDEX(number, '.', 1) DESC, 

sentenza

# Scala Installation
wget https://downloads.lightbend.com/scala/2.12.2/scala-2.12.2.deb
sudo dpkg -i scala-2.12.2.deb


# sbt Installation
echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2EE0EA64E40A89B84B2DF73499E82A75642AC823
sudo apt-get update
sudo apt-get install sbt

sentenza

NetworkManager WiFi Power Saving

NetworkManager supports WiFi powersaving but the function is rather undocumented.

From the source code: wifi.powersave can have the following value:

• NM_SETTING_WIRELESS_POWERSAVE_DEFAULT (0): use the default value
• NM_SETTING_WIRELESS_POWERSAVE_IGNORE (1): don't touch existing setting
• NM_SETTING_WIRELESS_POWERSAVE_DISABLE (2): disable powersave