LinqCollectionExtensions

using System.Collections.Generic;

namespace EvidenceCenter.NativeSQLiteParsing.Extensions
{
  public static class LinqCollectionExtensions
  {
    public static bool Any<TSource>(this TSource[] source)
      => source.Length > 0;

    public static TSource Last<TSource>(this TSource[] source)
      => source[source.Length - 1];

    public static TSource LastOrDefault<TSource>(this TSource[] source)
    {
      var length = source.Length;
      return length == 0 ? default(TSource) : source[length - 1];
    }

    public static TSource First<TSource>(this TSource[] source)
      => source[0];

    public static TSource FirstOrDefault<TSource>(this TSource[] source)
      => source.Length == 0 ? default(TSource) : source[0];

    public static int Count<TSource>(this TSource[] source)
      => source.Length;

    public static bool Any<TSource>(this ICollection<TSource> source)
      => source.Count > 0;

    public static TSource Last<TSource>(this IList<TSource> source)
      => source[source.Count - 1];

    public static TSource LastOrDefault<TSource>(this IList<TSource> source)
    {
      var count = source.Count;
      return count == 0 ? default(TSource) : source[count - 1];
    }

    public static TSource First<TSource>(this IList<TSource> source)
      => source[0];

    public static TSource FirstOrDefault<TSource>(this IList<TSource> source)
      => source.Count == 0 ? default(TSource) : source[0];

    public static int Count<TSource>(this ICollection<TSource> source)
      => source.Count;
  }
}