Split a character string based on change of character: Difference between revisions

=={{header|C sharp}}==

<lang csharp>using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

string s = @"gHHH5YY++///\";

Console.WriteLine(s.RunLengthSplit().Delimit(", "));

}

public static class Extensions

{

public static IEnumerable<string> RunLengthSplit(this string source) {

using (var enumerator = source.GetEnumerator()) {

if (!enumerator.MoveNext()) yield break;

char previous = enumerator.Current;

int count = 1;

while (enumerator.MoveNext()) {

if (previous == enumerator.Current) {

count++;

} else {

yield return new string(Enumerable.Repeat(previous, count).ToArray());

previous = enumerator.Current;

count = 1;

}

}

yield return new string(Enumerable.Repeat(previous, count).ToArray());

}

}

public static string Delimit<T>(this IEnumerable<T> source, string separator = "") => string.Join(separator ?? "", source);

}</lang>

{{out}}

<pre>

g, HHH, 5, YY, ++, ///, \

</pre>