tests/gtest-anon-33.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Text;
   4
   5 public static class IEnumerableRocks
   6 {
   7
   8         public static string Implode<TSource, TResult> (this IEnumerable<TSource> self, string separator, Func<TSource, TResult> selector)
   9         {
  10                 return Implode (self, separator, (b, e) => { b.Append (selector (e).ToString ()); });
  11         }
  12
  13         public static string Implode<TSource> (this IEnumerable<TSource> self, string separator, Action<StringBuilder, TSource> appender)
  14         {
  15                 var coll = self as ICollection<TSource>;
  16                 if (coll != null && coll.Count == 0)
  17                         return string.Empty;
  18
  19                 bool needSep = false;
  20                 var s = new StringBuilder ();
  21
  22                 foreach (var element in self) {
  23                         if (needSep && separator != null)
  24                                 s.Append (separator);
  25
  26                         appender (s, element);
  27                         needSep = true;
  28                 }
  29
  30                 return s.ToString ();
  31         }
  32 }
  33
  34 class Test
  35 {
  36         public static void Main ()
  37         {
  38                 Console.WriteLine (new [] { "foo", "bar" }.Implode (", ", e => "'" + e + "'"));
  39         }
  40 }