add FirstOrDefault

ShittyLINQ/Count.cs

@@ -10,5 +10,17 @@ public static long Count<T>(this IEnumerable<T> self)
         {
             return self.Aggregate(0L, (memo, v) => ++memo);
         }
+
+        public static long Count<T>(this IEnumerable<T> self , Func<T, bool> predicate)
+        {
+            if (self == null || predicate == null) throw new ArgumentNullException();
+            Func<List<T>, T, List<T>> mapFunc = (memo, obj) =>
+            {
+                if (predicate(obj)) memo.Add(obj);
+                return memo;
+            };
+            var output = self.Foldl(new List<T>(), mapFunc);
+            return output.Aggregate(0L, (memo, v) => ++memo);
+        }
     }
 }

ShittyLINQ/FirstOrDefault.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ShittyLINQ
+{
+    public static partial class Extensions
+    {
+        public static T FirstOrDefault<T>(this IEnumerable<T> self)
+        {
+            if (self == null) throw new ArgumentNullException();
+            var iterator = self.GetEnumerator();
+            if (!iterator.MoveNext()) return default(T);
+            return iterator.Current;
+        }
+    }
+}