instantiate automatically a trait or an abstract using a lambda / published by https://github.com/dacr/code-examples-manager #0e3cf69d-15ce-4053-8221-029f97d7de2d/df15cdb517eacc08082f3548eafa029625c29b6f

scala-feature-instantiate-through-lambda.sc

// summary : instantiate automatically a trait or an abstract using a lambda
// keywords : scala, language-feature, lambda, autoinstantiate, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 0e3cf69d-15ce-4053-8221-029f97d7de2d
// created-on : 2021-07-06T18:27:07+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// execution : scala ammonite script (http://ammonite.io/) - run as follow 'amm scriptname.sc'
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
// ---------------------

// ----------------------------------------------------------------
// works with trait
trait Truc {
  def machin(x:String):Int
}

val truc:Truc = x => x.toInt

println(truc.machin("42"))

// ----------------------------------------------------------------
// also works with abstract class, in all case if and only if there's just one undefined function
abstract class Bidule{
  def blah(x:String):Int = 42
  def bouh(x:Int, y:Int):Int
}

val bidule: Bidule = (x, y) => x + y
println(bidule.bouh(40, 2))

// ----------------------------------------------------------------
println("Thanks to RockTheJVM for this nice scala trick")
println("https://www.youtube.com/watch?v=aX-Lc6NXhC8&ab_channel=RocktheJVM")