CODEWITHSUNDEEP
f#
Raj
Raj

Reputation: 27

Need help converting C# to F#

I'd like to know how to convert this code line by line from C# to F#. I am not looking to use any kind of F#'s idioms or something of the like. I am trying to understand how to enumaration and reflcetion in F#.

using System.Linq;

namespace System.Collections.Generic
{
    public static class EnumerableExtensions
    {
        private static readonly Random random;
        static EnumerableExtensions()
        {
            random = new Random();
        }
        public static T Random<T>(this IEnumerable<T> input)
        {
            return input.ElementAt(random.Next(input.Count()));
        }
    }
}

Upvotes: 0

Views: 48

Answers (1)

Tomas Petricek
Tomas Petricek

Reputation: 243116

You can define extensions as static methods in a type, but you have to mark those with the Extension attribute. A direct rewrite of your C# code would be:

open System.Runtime.CompilerServices

[<Extension>]
type EnumerableExtensions() =
  static let rnd = System.Random()
  [<Extension>]
  static member Random(input:seq<_>) = 
    input |> Seq.item (rnd.Next(Seq.length input))

[1;2;3].Random()

Upvotes: 1

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