Creates a list by applying a delegate to pairs of items in the IEnumerable : IEnumerable « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. IEnumerable

Creates a list by applying a delegate to pairs of items in the IEnumerable

  

using System.Linq;
using System.Diagnostics;
namespace System.Collections.Generic
{
    public static class EnumeratorExtensions
    {


        /// <summary>
        /// Creates a list by applying a delegate to pairs of items in the IEnumerable&lt;T&gt;.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="source">The source list of items.</param>
        /// <param name="zipFunction">The delegate to use to combine items.</param>
        /// <returns></returns>
        public static IEnumerable<TResult> Scan<T, TResult>(this IEnumerable<T> source, Func<T, T, TResult> combine)
        {
            if (source == null)
                throw new ArgumentNullException("source");
            if (combine == null)
                throw new ArgumentNullException("combine");

            return ScanIterator<T, TResult>(source, combine);
        }

        private static IEnumerable<TResult> ScanIterator<T, TResult>(IEnumerable<T> source, Func<T, T, TResult> combine)
        {
            Debug.Assert(source != null, "source is null.");
            Debug.Assert(combine != null, "combine is null.");

            using (IEnumerator<T> data = source.GetEnumerator())
                if (data.MoveNext())
                {
                    T first = data.Current;

                    while (data.MoveNext())
                    {
                        yield return combine(first, data.Current);
                        first = data.Current;
                    }
                }
        }
    }
}

   
    
  

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