wabbajack/Wabbajack.Common/IEnumerableExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace Wabbajack.Common
{
    public static class IEnumerableExtensions
    {
        public static void Do<T>(this IEnumerable<T> coll, Action<T> f)
        {
            foreach (var i in coll) f(i);
        }


        public static IEnumerable<TOut> TryKeep<TIn, TOut>(this IEnumerable<TIn> coll, Func<TIn, (bool, TOut)> fn)
        {
            return coll.Select(fn).Where(p => p.Item1).Select(p => p.Item2);
        }

        public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> coll)
        {
            var rnd = new Random();
            var data = coll.ToArray();
            for (var x = 0; x < data.Length; x++)
            {
                var a = rnd.Next(0, data.Length);
                var b = rnd.Next(0, data.Length);

                (data[b], data[a]) = (data[a], data[b]);
            }

            return data;
        }

        public static IEnumerable<T> OnEach<T>(this IEnumerable<T> coll, Action<T> fn)
        {
            foreach (var itm in coll)
            {
                fn(itm);
                yield return itm;
            }
        }
    }
}