miguel-vila

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miguel-vila

trait MeasureTypeClass[A]{
  def measure(a: A) : Int
}

object TypeClassExample{
  def genericMeasure[A : MeasureTypeClass](value: A): Int = {
    val measurer = implicitly[MeasureTypeClass[A]]
    measurer.measure(value)
  }
  

miguel-vila

Advanced Scala:

Monad intros:

1. A nice intro: Scala Monads: Declutter Your Code With Monadic Design [YouTube]

Some monads:

1. Scalaz State Monad
2. Reader Monad for dependency injection

miguel-vila

import scalaz.contrib.std.FutureInstances // Dependency: scalaz-contrib
import scalaz.{ Monad , OptionT } // Dependency: scalaz
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future

class FutureAndOptionComposition[A, B, C, D] 
extends FutureInstances 
// The FutureInstances trait has a method which creates a Monad instance 
// for Future which is used implicitly by the OptionT
{