41 lines
942 B
C#
41 lines
942 B
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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public static class IEnumerableRocks
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{
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public static string Implode<TSource, TResult> (this IEnumerable<TSource> self, string separator, Func<TSource, TResult> selector)
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{
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return Implode (self, separator, (b, e) => { b.Append (selector (e).ToString ()); });
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}
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public static string Implode<TSource> (this IEnumerable<TSource> self, string separator, Action<StringBuilder, TSource> appender)
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{
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var coll = self as ICollection<TSource>;
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if (coll != null && coll.Count == 0)
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return string.Empty;
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bool needSep = false;
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var s = new StringBuilder ();
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foreach (var element in self) {
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if (needSep && separator != null)
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s.Append (separator);
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appender (s, element);
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needSep = true;
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}
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return s.ToString ();
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}
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}
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class Test
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{
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public static void Main ()
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{
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Console.WriteLine (new [] { "foo", "bar" }.Implode (", ", e => "'" + e + "'"));
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}
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}
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