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## Advanced-FP-with-Scala.md

      
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                nachinius
                / Advanced-FP-with-Scala.md
            
            
              Created
              March 20, 2018 14:01
                — forked from jdegoes/Applied-FP-with-Scala.md
            
          
    Advanced Functional Programming with Scala - Notes

Copyright © 2016-2017 Fantasyland Institute of Learning. All rights reserved.
1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.
val square : Int => Int = x => x * x

  
## http4s-error-handling-mtl.scala
import cats.{ ApplicativeError, MonadError }
import cats.data.{ Kleisli, OptionT }
import cats.effect.Sync
import cats.effect.concurrent.Ref
import cats.syntax.all._
import io.circe.generic.auto._
import io.circe.syntax._
import org.http4s._
import org.http4s.circe.CirceEntityDecoder._
import org.http4s.circe._

## sleep5.sh
while true; do date; sleep 5; done
	import cats.{ ApplicativeError, MonadError }
	import cats.data.{ Kleisli, OptionT }
	import cats.effect.Sync
	import cats.effect.concurrent.Ref
	import cats.syntax.all._
	import io.circe.generic.auto._
	import io.circe.syntax._
	import org.http4s._
	import org.http4s.circe.CirceEntityDecoder._
	import org.http4s.circe._