From 5677da0b4253323f6af2309e869f570274bc2fe5 Mon Sep 17 00:00:00 2001
From: jw <icecreamburglar@gmail.com>
Date: Mon, 1 Oct 2018 14:08:20 -0500
Subject: [PATCH 1/4] DefaultEmpty added

---
 ShittyLINQ/DefaultIfEmpty.cs           | 31 +++++++++++++++++++
 ShittyLinqTests/DefaultIfEmptyTests.cs | 43 ++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 ShittyLINQ/DefaultIfEmpty.cs
 create mode 100644 ShittyLinqTests/DefaultIfEmptyTests.cs

diff --git a/ShittyLINQ/DefaultIfEmpty.cs b/ShittyLINQ/DefaultIfEmpty.cs
new file mode 100644
index 0000000..efe409d
--- /dev/null
+++ b/ShittyLINQ/DefaultIfEmpty.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ShittyLINQ
+{
+    public static partial class Extensions
+    {
+        public static IEnumerable<T> DefaultIfEmpty<T>(this IEnumerable<T> source)
+        {
+            return DefaultIfEmpty(source, default(T));
+        }
+
+        public static IEnumerable<T> DefaultIfEmpty<T>(this IEnumerable<T> self, T defaultValue)
+        {
+            if (defaultValue == null) throw new ArgumentNullException();
+            if (self == null || self.Count() <= 0)
+            {
+                yield return defaultValue;
+            }
+            else
+            {
+                var iterator = self.GetEnumerator();
+                while (iterator.MoveNext())
+                {
+                    yield return iterator.Current;
+                }
+            }
+        }
+    }
+}
diff --git a/ShittyLinqTests/DefaultIfEmptyTests.cs b/ShittyLinqTests/DefaultIfEmptyTests.cs
new file mode 100644
index 0000000..92cdbbd
--- /dev/null
+++ b/ShittyLinqTests/DefaultIfEmptyTests.cs
@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using ShittyLINQ;
+using Enumerable = System.Linq.Enumerable;
+
+namespace ShittyTests
+{
+    [TestClass]
+    public class DefaultIfEmptyTests
+    {
+        [TestMethod]
+        public void Default_NotEmpty()
+        {
+            int[] source = { 1, 2, 3 };
+            int[] expectedResult = { 1, 2, 3 };
+
+            var result = source.DefaultIfEmpty(0);
+            Assert.IsTrue(Enumerable.SequenceEqual(expectedResult, result));
+        }
+
+        [TestMethod]
+        public void Default_Empty()
+        {
+            int[] source = { };
+            int[] expectedResult = { 0 };
+
+            var result = source.DefaultIfEmpty(0);
+            Assert.IsTrue(Enumerable.SequenceEqual(expectedResult, result));
+        }
+
+        [TestMethod]
+        public void Default_EnumerableNull()
+        {
+            int[] source = null;
+            int[] expectedResult = { 0 };
+
+            var result = source.DefaultIfEmpty(0);
+            Assert.IsTrue(Enumerable.SequenceEqual(expectedResult, result));
+        }
+    }
+}

From f8dbd13bdf3604927c73a77b976cc19d19b65b44 Mon Sep 17 00:00:00 2001
From: IcecreamBurglar <icecreamburglar@gmail.com>
Date: Mon, 1 Oct 2018 14:15:07 -0500
Subject: [PATCH 2/4] Added in undocumented exceptions

The way this method works in Linq appears to be like this after playing around with the Linq implementation.
Exceptions for this extension aren't documented.
---
 ShittyLINQ/DefaultIfEmpty.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ShittyLINQ/DefaultIfEmpty.cs b/ShittyLINQ/DefaultIfEmpty.cs
index efe409d..930af39 100644
--- a/ShittyLINQ/DefaultIfEmpty.cs
+++ b/ShittyLINQ/DefaultIfEmpty.cs
@@ -13,8 +13,8 @@ public static IEnumerable<T> DefaultIfEmpty<T>(this IEnumerable<T> source)
 
         public static IEnumerable<T> DefaultIfEmpty<T>(this IEnumerable<T> self, T defaultValue)
         {
-            if (defaultValue == null) throw new ArgumentNullException();
-            if (self == null || self.Count() <= 0)
+            if (self == null) throw new ArgumentNullException();
+            if (self.Count() <= 0)
             {
                 yield return defaultValue;
             }

From e633ad2d58e02834198919b3c5fd0edb8ad553ec Mon Sep 17 00:00:00 2001
From: IcecreamBurglar <icecreamburglar@gmail.com>
Date: Thu, 4 Oct 2018 00:58:36 -0500
Subject: [PATCH 3/4] Removed unused using

---
 ShittyLINQ/DefaultIfEmpty.cs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/ShittyLINQ/DefaultIfEmpty.cs b/ShittyLINQ/DefaultIfEmpty.cs
index 930af39..f7fac4d 100644
--- a/ShittyLINQ/DefaultIfEmpty.cs
+++ b/ShittyLINQ/DefaultIfEmpty.cs
@@ -1,6 +1,5 @@
-using System;
+using System;
 using System.Collections.Generic;
-using System.Text;
 
 namespace ShittyLINQ
 {

From 51983892cc7860ff53d4ddf6350d2fc8e1ecbc7c Mon Sep 17 00:00:00 2001
From: IcecreamBurglar <icecreamburglar@gmail.com>
Date: Thu, 4 Oct 2018 01:05:46 -0500
Subject: [PATCH 4/4] Update DefaultIfEmptyTests.cs

---
 ShittyLinqTests/DefaultIfEmptyTests.cs | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/ShittyLinqTests/DefaultIfEmptyTests.cs b/ShittyLinqTests/DefaultIfEmptyTests.cs
index 92cdbbd..039356c 100644
--- a/ShittyLinqTests/DefaultIfEmptyTests.cs
+++ b/ShittyLinqTests/DefaultIfEmptyTests.cs
@@ -1,6 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using ShittyLINQ;
 using Enumerable = System.Linq.Enumerable;