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  1. using System;
  2. using System.Linq;
  3.  
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		    var names = new[] {
  10.         		"DOG_BOB",
  11.         		"CAT_ROB",
  12.         		"DOG_DANNY",
  13.         		"MOUSE_MICKEY",
  14.         		"DOG_STEVE",
  15.         		"HORSE_NEIGH",
  16.         		"CAT_RUDE",
  17.         		"HORSE_BOO",
  18.         		"MOUSE_STUPID",
  19.         	};
  20.  
  21.             var grouped = names.GroupBy(s => s.Substring(0, s.IndexOf("_")))
  22.                                .Select(g => string.Join(",", g.ToArray()))
  23.                                .ToArray();
  24.  
  25.             Console.Write(string.Join("\n", grouped));
  26.  
  27. 	}
  28. }
Success #stdin #stdout 0.06s 34216KB
comments (?)
stdin 
Standard input is empty
stdout 
DOG_BOB,DOG_DANNY,DOG_STEVE
CAT_ROB,CAT_RUDE
MOUSE_MICKEY,MOUSE_STUPID
HORSE_NEIGH,HORSE_BOO
https://ideone.com/KQBIBa
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
secret

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