Scala equivalent of C#’s extension methods?

Question

In C# you can write:

using System.Numerics;
namespace ExtensionTest {
public static class MyExtensions {
    public static BigInteger Square(this BigInteger          


        

Answer 1

Since version 2.10 of Scala, it is possible to make an entire class eligible for implicit conversion

implicit class RichInt(i: Int) {
  def square = i * i
}

In addition, it is possible to avoid creating an instance of the extension type by having it extend AnyVal

implicit class RichInt(val i: Int) extends AnyVal {
  def square = i * i
}

For more information on implicit classes and AnyVal, limitations and quirks, consult the official documentation:

• http://docs.scala-lang.org/overviews/core/implicit-classes.html
• http://docs.scala-lang.org/overviews/core/value-classes.html