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  1. using System;
  2.  
  3. public static class StringExtensions {
  4.     // string is an existing class! :O
  5.     public static string Foo(this string x) {
  6.         return x + "hahaha";
  7.     }
  8. }
  9.  
  10. public static class Program {
  11.     public static void Main(string[] args) {
  12.         // just use . notation! :O
  13.         Console.WriteLine("{0}", "lol".Foo());
  14.     }
  15. }
  16.  
Success #stdin #stdout 0.02s 33912KB
comments (?)
stdin 
Standard input is empty
stdout 
lolhahaha
https://ideone.com/egoDmr
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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