C Sharp Remove Whitespace common methods speed tests

Here's some common methods that are timed for removing white-space from a string.

Also see - Fastest method to remove all whitespace from Strings in .NET - CodeProject

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using System;using System.Text; using System.Diagnostics; using System.Linq; public static class Program { public static string RemoveWhiteSpace(this string s) { char[] r = new char[s.Length]; int idxr = 0; for (int i = 0; i < s.Length; i++) { if ( !Char.IsWhiteSpace(s[i])) { r[idxr] = s[i]; idxr++; } } return new string(r); } public static string StringBuilderRemoveWhiteSpace(this string s) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < s.Length; i++) { if ( !Char.IsWhiteSpace(s[i])) { sb.Append(s[i]); } } return sb.ToString(); } public static string LinqRemoveWhiteSpace(this string s) { return new string(s.ToCharArray().Where(c => !Char.IsWhiteSpace(c)).ToArray()); } //public static string NormalizeWhiteSpaceForLoop(this string input) public static string FastRemoveWhiteSpace(this string input) { int len = input.Length, index = 0, i = 0; var src = input.ToCharArray(); //bool skip = false; char ch; for (; i < len; i++) { ch = src[i]; switch (ch) { case '\u0020': case '\u00A0': case '\u1680': case '\u2000': case '\u2001': case '\u2002': case '\u2003': case '\u2004': case '\u2005': case '\u2006': case '\u2007': case '\u2008': case '\u2009': case '\u200A': case '\u202F': case '\u205F': case '\u3000': case '\u2028': case '\u2029': case '\u0009': case '\u000A': case '\u000B': case '\u000C': case '\u000D': case '\u0085': //if (skip) continue; //src[index++] = ch; //skip = true; continue; default: //skip = false; src[index++] = ch; continue; } } return new string(src, 0, index); } public static void Main() { Stopwatch sw = new Stopwatch(); string test = "China lashes out at Hong Kong protest targeting its office Mon 22-Jul-19 10:33am"; sw.Start(); Console.WriteLine(test.RemoveWhiteSpace()); sw.Stop(); Console.WriteLine(sw.ElapsedTicks.ToString()+" ticks."); sw.Restart(); Console.WriteLine(test.StringBuilderRemoveWhiteSpace()); sw.Stop(); Console.WriteLine(sw.ElapsedTicks.ToString()+" ticks."); sw.Restart(); Console.WriteLine(test.LinqRemoveWhiteSpace()); sw.Stop(); Console.WriteLine(sw.ElapsedTicks.ToString()+" ticks."); sw.Restart(); Console.WriteLine(test.FastRemoveWhiteSpace()); sw.Stop(); Console.WriteLine(sw.ElapsedTicks.ToString()+" ticks."); } }