mkovacek

name := """play-scala"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayScala)

scalaVersion := "2.11.7"

libraryDependencies ++= Seq(
  jdbc,

mkovacek

# This is the main configuration file for the application.
# https://www.playframework.com/documentation/latest/ConfigFile
# ~~~~~
# Play uses HOCON as its configuration file format.  HOCON has a number
# of advantages over other config formats, but there are two things that
# can be used when modifying settings.
#
# You can include other configuration files in this main application.conf file:
#include "extra-config.conf"
#

mkovacek

[info] application - Creating Pool for datasource 'db'
[error] c.z.h.HikariConfig - either dataSource or dataSourceClassName is required
[error] application - 
[info] 
[info] ! @7105kp1a7 - Internal server error, for (GET) [/] ->
[info]  
[info] play.api.Configuration$$anon$1: Configuration error[Cannot connect to database [db]]
[info] 	at play.api.Configuration$.configError(Configuration.scala:154)
[info] 	at play.api.Configuration.reportError(Configuration.scala:806)
[info] 	at play.api.db.DefaultDBApi$$anonfun$connect$1.apply(DefaultDBApi.scala:48)

mkovacek

Libraries

• Web framework: Play
• Actors: akka
• Authentication: ?
• Authorization: ?
• ORM: doobie (for PostgreSQL)
• Evolutions: flyaway
• I/O: better-files
• JSON: circe + play-circe

mkovacek

val name: String = "Scala"

//shorter
val newName = "Scala"

// you can't assign new value
newName = "Java" // Error: reassignment to val name = "Java"

mkovacek

var age = 23

//you can assign new values
age = 24
age = 25

mkovacek

val nameOfImmutableVariable: type = value
var nameOfMutableVariable: type = value

mkovacek

def methodName (argument: argumentType): returnType = {
  //body of the method
}

mkovacek

def printHelloWorld: Unit = {
  println("Hello world")
}

mkovacek

def sum(a: Int, b: Int): Int = {
  a + b
}