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    <p>A good example is the sieve of eratosthenes.</p> <p>A co-worker and I wrote similar sieves in C# and F#. The performance of the C# version was almost 10 times slower than it's functional counterpart written by my co-worker.</p> <p>There were probably some inefficiencies in the C# version that could have been cleaned up, but the F# version is noticeably faster.</p> <p>This sort of problem lends itself to being written in a functional language..</p> <p>Hope this helps some.</p> <p><strong>Edit -</strong></p> <p>Here's one of the C# examples using similar functionality to F#'s List.Partition. I'll keep looking for the F# example. I have hundreds of projects that it could be in, it's just a matter of sorting through all of my stuff to find it (I save everything I ever experiment with, so this could be time consuming.. lol)</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ListPartitionTest { public static class IEnumerableExtensions { public static KeyValuePair&lt;IEnumerable&lt;T&gt;, IEnumerable&lt;T&gt;&gt; Partition&lt;T&gt;(this IEnumerable&lt;T&gt; items, Func&lt;T, bool&gt; f) { return items.Aggregate( new KeyValuePair&lt;IEnumerable&lt;T&gt;, IEnumerable&lt;T&gt;&gt;(Enumerable.Empty&lt;T&gt;(), Enumerable.Empty&lt;T&gt;()), (acc, i) =&gt; { if (f(i)) { return new KeyValuePair&lt;IEnumerable&lt;T&gt;, IEnumerable&lt;T&gt;&gt;(acc.Key.Concat(new[] { i }), acc.Value); } else { return new KeyValuePair&lt;IEnumerable&lt;T&gt;, IEnumerable&lt;T&gt;&gt;(acc.Key, acc.Value.Concat(new[] { i })); } }); } } class PrimeNumbers { public int Floor { get; private set; } public int Ceiling { get; private set; } private IEnumerable&lt;int&gt; _sieve; public PrimeNumbers(int floor, int ceiling) { Floor = floor; Ceiling = ceiling; } public List&lt;int&gt; Go() { _sieve = Enumerable.Range(Floor, (Ceiling - Floor) + 1).ToList(); for (int i = (Floor &lt; 2) ? 2 : Floor; i &lt;= Math.Sqrt(Ceiling); i++) { _sieve = _sieve.Where(x =&gt; (x % i != 0 &amp;&amp; x != i)); foreach (int x in _sieve) { Console.Write("{0}, ", x); } Console.WriteLine(); } return _sieve.ToList(); } } class Program { static void Main(string[] args) { System.Diagnostics.Stopwatch s = new System.Diagnostics.Stopwatch(); int floor = 1; int ceiling = 10; s.Start(); PrimeNumbers p = new PrimeNumbers(floor, ceiling); p.Go(); //foreach (int i in p.Go()) Console.Write("{0} ", i); s.Stop(); Console.WriteLine("\n{0} to {1} completed in {2}", floor, ceiling, s.Elapsed.TotalMilliseconds); Console.ReadLine(); } } } </code></pre>
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    1. POHow well does F# perform compared to C#?
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    1. COwould be interesting to see code samples side by side...
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    2. COI'll see if I can find them and I'll post them. The big time saver in F# was List.Partition.. In C#, the solution we used was a big List.Aggregate function to do something similar..
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    3. COI think that code use most of the time writing to the console...
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