diff --git a/BeefLibs/corlib/src/Array.bf b/BeefLibs/corlib/src/Array.bf
index 385655bb..3421cf2d 100644
--- a/BeefLibs/corlib/src/Array.bf
+++ b/BeefLibs/corlib/src/Array.bf
@@ -363,6 +363,44 @@ namespace System
 			return .(this);
 		}
 
+		public void SetAll(T value)
+		{
+			for (int i < mLength)
+				(&mFirstElement)[i] = value;
+		}
+
+		public bool Contains(T value)
+		{
+			for (int i = 0; i < mLength; i++)
+				if ((&mFirstElement)[i] == value)
+					return true;
+			return false;
+		}
+
+		public bool ContainsStrict(T value)
+		{
+			for (int i = 0; i < mLength; i++)
+				if ((&mFirstElement)[i] === value)
+					return true;
+			return false;
+		}
+
+		public int IndexOf(T value)
+		{
+			for (int i = 0; i < mLength; i++)
+				if ((&mFirstElement)[i] == value)
+					return i;
+			return -1;
+		}
+
+		public int IndexOfStrict(T value)
+		{
+			for (int i = 0; i < mLength; i++)
+				if ((&mFirstElement)[i] === value)
+					return i;
+			return -1;
+		}
+
         protected override void GCMarkMembers()
         {
 			let type = typeof(T);
diff --git a/BeefLibs/corlib/src/Collections/List.bf b/BeefLibs/corlib/src/Collections/List.bf
index f712e655..7273c586 100644
--- a/BeefLibs/corlib/src/Collections/List.bf
+++ b/BeefLibs/corlib/src/Collections/List.bf
@@ -551,6 +551,14 @@ namespace System.Collections
 			mSize = (.)size;
 		}
 
+		public void Resize(int newSize, T fillValue)
+		{
+		    let prevSize = mSize;
+		    Count = newSize;
+	        for (int i = prevSize; i < newSize; i++)
+	            mItems[i] = fillValue;
+		}
+
 		public Enumerator GetEnumerator()
 		{
 			return Enumerator(this);
@@ -636,6 +644,19 @@ namespace System.Collections
 			return -1;
 		}
 
+		public void Set(Span<T> span)
+		{
+			Count = span.Length;
+			for (int i < mSize)
+				mItems[i] = span[i];
+		}
+
+		public void SetAll(T value)
+		{
+			for (int i < mSize)
+				mItems[i] = value;
+		}
+
 		public void Insert(int index, T item)
 		{
 			var item; // This creates a copy - required if item is a ref to an element
diff --git a/BeefLibs/corlib/src/Compiler.bf b/BeefLibs/corlib/src/Compiler.bf
index 1b60811b..f98559b5 100644
--- a/BeefLibs/corlib/src/Compiler.bf
+++ b/BeefLibs/corlib/src/Compiler.bf
@@ -292,6 +292,13 @@ namespace System
 				Runtime.FatalError("Assert failed");
 		}
 
+		[Comptime(ConstEval = true)]
+		public static void Assert(bool cond, String message)
+		{
+		    if (!cond)
+		        Runtime.FatalError(message);
+		}
+
 		static extern void Comptime_SetReturnType(int32 typeId);
 		static extern void* Comptime_MethodBuilder_EmitStr(void* native, StringView str);
 		static extern void* Comptime_CreateMethod(int32 typeId, StringView methodName, Type returnType, MethodFlags methodFlags);
diff --git a/BeefLibs/corlib/src/SizedArray.bf b/BeefLibs/corlib/src/SizedArray.bf
index c8233893..aef8e972 100644
--- a/BeefLibs/corlib/src/SizedArray.bf
+++ b/BeefLibs/corlib/src/SizedArray.bf
@@ -15,8 +15,6 @@ namespace System
 			}
 		}	
 
-		
-
 		public explicit static operator T[CSize] (Self val)
 		{
 			return val.mVal;
@@ -28,6 +26,44 @@ namespace System
 			return .(&val.mVal, CSize);
 		}
 
+		public void SetAll(T value)
+		{
+			for (int i < CSize)
+				mVal[i] = value;
+		}
+
+		public bool Contains(T value)
+		{
+			for (int i = 0; i < CSize; i++)
+				if (mVal[i] == value)
+					return true;
+			return false;
+		}
+
+		public bool ContainsStrict(T value)
+		{
+			for (int i = 0; i < CSize; i++)
+				if (mVal[i] === value)
+					return true;
+			return false;
+		}
+
+		public int IndexOf(T value)
+		{
+			for (int i = 0; i < CSize; i++)
+				if (mVal[i] == value)
+					return i;
+			return -1;
+		}
+
+		public int IndexOfStrict(T value)
+		{
+			for (int i = 0; i < CSize; i++)
+				if (mVal[i] === value)
+					return i;
+			return -1;
+		}
+
 		public override void ToString(String strBuffer) mut
 		{
 			if (typeof(T) == typeof(char8))
diff --git a/BeefLibs/corlib/src/String.bf b/BeefLibs/corlib/src/String.bf
index 5b93082a..e8a605ac 100644
--- a/BeefLibs/corlib/src/String.bf
+++ b/BeefLibs/corlib/src/String.bf
@@ -2634,6 +2634,18 @@ namespace System
 			}
 		}
 
+		public static bool Equals(char8* str1, char8* str2, int length)
+		{
+			for (int i < length)
+			{
+				char8 c = str1[i];
+				char8 c2 = str2[i];
+				if (c != c2)
+					return false;
+			}
+			return true;
+		}
+
 		public RawEnumerator RawChars
 		{
 			[Inline]