Declarations.scala

  import language.higherKinds
  trait A {
    type F[_[_]]
  }

  class  B extends  A{
    override type F[X[_]] = X[Int]
  }
  val b = new B // This is valid
  val a = new A { // But this is not

vipmax

Kafka installation with systemd

0. Create kafka user

sudo adduser kafka
sudo adduser kafka sudo
su -l kafka

1. Download and Install kafka archive

ClementNerma

ZSH CheatSheet

This is a cheat sheet for how to perform various actions to ZSH, which can be tricky to find on the web as the syntax is not intuitive and it is generally not very well-documented.

Strings

Description	Syntax
Get the length of a string	${#VARNAME}
Get a single character	${VARNAME[index]}