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instantiate automatically a trait or an abstract using a lambda / published by https://github.com/dacr/code-examples-manager #0e3cf69d-15ce-4053-8221-029f97d7de2d/7f55d6f4b42e8498a091dddc0e2e205f843ae2f1
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// 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 "3.1.1" | |
// --------------------- | |
// ---------------------------------------------------------------- | |
// 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") |
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