diff --git a/src/UserData/UserDataCollectionType.cpp b/src/UserData/UserDataCollectionType.cpp
new file mode 100644
index 0000000..88d562f
--- /dev/null
+++ b/src/UserData/UserDataCollectionType.cpp
@@ -0,0 +1 @@
+#include "UserDataCollectionType.hpp"
diff --git a/src/UserData/UserDataCollectionType.hpp b/src/UserData/UserDataCollectionType.hpp
new file mode 100644
index 0000000..789a7a5
--- /dev/null
+++ b/src/UserData/UserDataCollectionType.hpp
@@ -0,0 +1,61 @@
+#ifndef PORYGONLANG_USERDATACOLLECTIONTYPE_HPP
+#define PORYGONLANG_USERDATACOLLECTIONTYPE_HPP
+
+#include <utility>
+#include "../ScriptTypes/ScriptType.hpp"
+
+namespace Porygon::UserData {
+    class UserDataCollectionType : public ScriptType {
+        shared_ptr<const ScriptType> _keyType;
+        shared_ptr<const ScriptType> _valueType;
+        const bool _indexable;
+        const bool _iterable;
+    public:
+        UserDataCollectionType(shared_ptr<const ScriptType> keyType, shared_ptr<const ScriptType> valueType,
+                               bool indexable, bool iterable)
+                : ScriptType(TypeClass::Table),
+                  _keyType(std::move(keyType)),
+                  _valueType(std::move(valueType)),
+                  _indexable(indexable),
+                  _iterable(iterable)
+        {}
+
+        static shared_ptr<UserDataCollectionType> CreateIndexable(const shared_ptr<const ScriptType>& keyType, const shared_ptr<const ScriptType>& valueType){
+            return make_shared<UserDataCollectionType>(keyType, valueType, true, true);
+        }
+
+        static UserDataCollectionType* CreateIndexable(const ScriptType* keyType, const ScriptType* valueType){
+            return new UserDataCollectionType(shared_ptr<const ScriptType>(keyType),
+                    shared_ptr<const ScriptType>(valueType), true, true);
+        }
+
+        static shared_ptr<UserDataCollectionType> CreateIterable(const shared_ptr<const ScriptType>& valueType){
+            return make_shared<UserDataCollectionType>(nullptr, valueType, false, true);
+        }
+
+        bool CanBeIndexedWith(const ScriptType* indexer) const final{
+            if (!_indexable){
+                return false;
+            }
+            return indexer->operator==(_keyType.get());
+        }
+
+        [[nodiscard]] shared_ptr<const ScriptType> GetIndexedType(const ScriptType* indexer) const final{
+            return _valueType;
+        }
+
+        [[nodiscard]] bool CanBeIterated() const final{
+            return _iterable;
+        }
+
+        [[nodiscard]] shared_ptr<const ScriptType> GetIteratorKeyType() const final{
+            if (_indexable){
+                return _keyType;
+            } else{
+                return _valueType;
+            }
+        }
+    };
+}
+
+#endif //PORYGONLANG_USERDATACOLLECTIONTYPE_HPP
diff --git a/src/UserData/UserDataCollectionValue.cpp b/src/UserData/UserDataCollectionValue.cpp
new file mode 100644
index 0000000..3aa1873
--- /dev/null
+++ b/src/UserData/UserDataCollectionValue.cpp
@@ -0,0 +1 @@
+#include "UserDataCollectionValue.hpp"
diff --git a/src/UserData/UserDataCollectionValue.hpp b/src/UserData/UserDataCollectionValue.hpp
new file mode 100644
index 0000000..8728036
--- /dev/null
+++ b/src/UserData/UserDataCollectionValue.hpp
@@ -0,0 +1,75 @@
+#ifndef PORYGONLANG_USERDATACOLLECTIONVALUE_HPP
+#define PORYGONLANG_USERDATACOLLECTIONVALUE_HPP
+
+#include <utility>
+
+#include "UserDataCollectionType.hpp"
+#include "../Evaluator/EvalValues/EvalValue.hpp"
+#include "../Utilities/Random.hpp"
+
+namespace Porygon::UserData {
+    class UserDataCollectionHelper{
+        void* _parentObject;
+        const EvalValue* (*_get)(void*, const EvalValue*);
+        void (*_set)(void*, const EvalValue* , const EvalValue*);
+
+    public:
+        UserDataCollectionHelper(void* parentObject,
+                                 const EvalValue* (*get)(void*, const EvalValue*),
+                                 void (*set)(void*, const EvalValue*, const EvalValue*))
+                                 : _parentObject(parentObject), _get(get), _set(set){}
+
+        const EvalValue* Get(const EvalValue* key) const{
+            return _get(_parentObject, key);
+        }
+
+        void Set(const EvalValue* key, const EvalValue* value) const{
+            _set(_parentObject, key, value);
+        }
+    };
+
+    class UserDataCollectionValue : public Evaluation::EvalValue{
+        shared_ptr<UserDataCollectionType> _type;
+        shared_ptr<const UserDataCollectionHelper> _helper;
+        const size_t _hash;
+        UserDataCollectionValue(shared_ptr<UserDataCollectionType> type,
+                                shared_ptr<const UserDataCollectionHelper> helper, size_t hash)
+                : _type(std::move(type)), _helper(std::move(helper)), _hash(hash)
+        {
+        }
+    public:
+
+        UserDataCollectionValue(ScriptType* type, const UserDataCollectionHelper* helper)
+                : _type((UserDataCollectionType*)type), _helper(helper), _hash(Utilities::Random::Get())
+        {
+        }
+
+
+        [[nodiscard]] TypeClass GetTypeClass() const final{
+            return TypeClass ::Table;
+        }
+
+        bool operator==(const EvalValue *b) const final{
+            return b->GetHashCode() == _hash;
+        }
+
+        [[nodiscard]] EvalValue* Clone() const final{
+            return new UserDataCollectionValue(_type, _helper, _hash);
+        }
+
+        [[nodiscard]] std::size_t GetHashCode() const final{
+            return _hash;
+        }
+
+        const EvalValue* IndexValue(const EvalValue *val) const final{
+            return _helper->Get(val);
+        }
+
+        void SetIndexValue(const EvalValue *key, const EvalValue* value) const final{
+            _helper->Set(key, value);
+        }
+    };
+}
+
+
+#endif //PORYGONLANG_USERDATACOLLECTIONVALUE_HPP
diff --git a/src/UserData/UserDataTemplates.hpp b/src/UserData/UserDataTemplates.hpp
index 6ec7894..6b0d887 100644
--- a/src/UserData/UserDataTemplates.hpp
+++ b/src/UserData/UserDataTemplates.hpp
@@ -28,6 +28,8 @@
 #define PORYGON_INTEGER_TYPE ((Porygon::ScriptType*)new Porygon::NumericScriptType(true, false))
 #define PORYGON_FLOAT_TYPE ((Porygon::ScriptType*)new Porygon::NumericScriptType(true, true))
 #define PORYGON_STRING_TYPE ((Porygon::ScriptType*)new Porygon::StringScriptType(false, 0))
+#define PORYGON_INDEXABLE_TYPE(keyType, valueType) \
+    ((Porygon::ScriptType*)Porygon::UserData::UserDataCollectionType::CreateIndexable(keyType, valueType))
 
 #define PORYGON_FIELD(fieldName, fieldType, getterHelper, setterHelper) \
     { \
@@ -42,7 +44,7 @@
     { \
         Porygon::Utilities::HashedString::ConstHash(#fieldName), \
             new Porygon::UserData::UserDataField(fieldType, \
-                [](void* obj) -> Porygon::Evaluation::EvalValue* { return new getterHelper;}, \
+                [](void* obj) -> const Porygon::Evaluation::EvalValue* { return new getterHelper;}, \
                 nullptr \
         ) \
     }, \
@@ -63,6 +65,30 @@
     PORYGON_READONLY_FIELD(fieldName, PORYGON_FLOAT_TYPE, \
         Porygon::EvaluationFloatEvalValue(((T_USERDATA*)obj)->fieldName))
 
+/*
+#define PORYGON_INDEXABLE_FIELD(fieldName, keyType, valueType) \
+    PORYGON_FIELD(fieldName, PORYGON_INDEXABLE_TYPE(keyType, valueType), \
+        const Porygon::Evaluation::IntegerEvalValue(((T_USERDATA*)obj)->fieldName), val->EvaluateInteger())
+*/
+
+#define PORYGON_READONLY_VECTOR_FIELD(fieldName, valueType) \
+    PORYGON_READONLY_FIELD(fieldName, PORYGON_INDEXABLE_TYPE(PORYGON_INTEGER_TYPE, valueType), \
+        Porygon::UserData::UserDataCollectionValue( \
+            PORYGON_INDEXABLE_TYPE(PORYGON_INTEGER_TYPE, valueType), \
+            new UserDataCollectionHelper( \
+                obj, \
+                [](void* obj, const EvalValue* v) -> const EvalValue*{ \
+                    auto index = v->EvaluateInteger() - 1; \
+                    auto val = ((T_USERDATA*)obj)->fieldName;\
+                    return EvalValueHelper::Create(val[index]); \
+                } \
+                , [](void* obj, const EvalValue* key, const EvalValue* value){ \
+                    auto index = key->EvaluateInteger() - 1;\
+                    ((T_USERDATA*)obj)->fieldName[index] = value->EvaluateInteger(); \
+            }) \
+        ) \
+    )
+
 
 #define PORYGON_FUNCTION(fieldName, returnType, ...) \
     { \
@@ -73,7 +99,8 @@
         \
         \
         [](void* obj) -> const Porygon::Evaluation::EvalValue* { \
-                auto t = new Porygon::Evaluation::GenericFunctionEvalValue(make_shared<GenericFunctionScriptType>(), rand()); \
+                auto t = new Porygon::Evaluation::GenericFunctionEvalValue(make_shared<GenericFunctionScriptType>(), \
+                        Porygon::Utilities::Random::Get()); \
                 t->RegisterOption(new Porygon::UserData::UserDataFunction( \
                 [](void* obj, const Porygon::Evaluation::EvalValue* par[], int parameterCount) \
                     -> const Porygon::Evaluation::EvalValue*{return ((const T_USERDATA*)obj)->invoke__##fieldName(obj, par, parameterCount);},  \
diff --git a/tests/integration/UserDataTests.cpp b/tests/integration/UserDataTests.cpp
index 917c120..21f5478 100644
--- a/tests/integration/UserDataTests.cpp
+++ b/tests/integration/UserDataTests.cpp
@@ -8,7 +8,10 @@
 #include "../../src/UserData/UserDataFunction.hpp"
 #include "../../src/UserData/UserDataFunctionType.hpp"
 #include "../../src/UserData/UserDataTemplates.hpp"
+#include "../../src/UserData/UserDataCollectionType.hpp"
+#include "../../src/UserData/UserDataCollectionValue.hpp"
 #include "../../src/Evaluator/EvalValues/EvalValueHelper.hpp"
+#include "../../src/Utilities/Random.hpp"
 
 using namespace Porygon;
 using namespace Porygon::UserData;
@@ -17,6 +20,7 @@ using namespace Porygon::Utilities;
 class UserDataTestObject{
 public:
     int foo = 10;
+    vector<int> fooVector = {5,10,15,25};
     int getFoo(){
         return foo;
     }
@@ -29,11 +33,17 @@ public:
 private:
     PORYGON_PREPARE_FUNCTION(UserDataTestObject, getFoo, IntegerEvalValue)
     PORYGON_PREPARE_FUNCTION(UserDataTestObject, Addition, IntegerEvalValue, (par[0] -> EvaluateInteger()), (par[1] -> EvaluateInteger()))
+    void __setFooVector(const EvalValue* key, const EvalValue* value){
+        auto index = key->EvaluateInteger();
+        fooVector[index] = value->EvaluateInteger();
+    }
+
 public:
     PORYGON_USERDATA(UserDataTestObject,
         PORYGON_INTEGER_FIELD(foo)
         PORYGON_INTEGER_FUNCTION(getFoo)
         PORYGON_INTEGER_FUNCTION(Addition, PORYGON_INTEGER_TYPE, PORYGON_INTEGER_TYPE)
+        PORYGON_READONLY_VECTOR_FIELD(fooVector, PORYGON_INTEGER_TYPE)
     )
 };
 
@@ -117,5 +127,51 @@ end
     UserDataStorage::ClearTypes();
 }
 
+TEST_CASE( "Gets userdata vector value", "[integration]" ) {
+    UserDataStorage::RegisterType(HashedString::ConstHash("testObject"), UserDataTestObject::__createUserData());
+    Script* script = Script::Create(R"(
+function testFunc(testObject obj)
+    return obj.fooVector[1]
+end
+)");
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    script->Evaluate();
+    auto func = (GenericFunctionEvalValue*)script -> GetVariable(u"testFunc");
+    auto funcType = func -> GetType();
+    REQUIRE(funcType->GetFirstOption()->GetReturnType()->GetClass() == TypeClass::Number);
+    auto obj = new UserDataTestObject();
+    auto parameter = new UserDataValue(HashedString::ConstHash("testObject"), obj);
+    auto result = script->CallFunction(u"testFunc", {parameter});
+    REQUIRE(result -> EvaluateInteger() == 5);
+    delete obj;
+    delete parameter;
+    delete result;
+    delete script;
+    delete func;
+    UserDataStorage::ClearTypes();
+}
+
+TEST_CASE( "Sets userdata vector value", "[integration]" ) {
+    UserDataStorage::RegisterType(HashedString::ConstHash("testObject"), UserDataTestObject::__createUserData());
+    Script* script = Script::Create(R"(
+function testFunc(testObject obj)
+    obj.fooVector[3] = 684
+end
+)");
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    script->Evaluate();
+    auto func = (GenericFunctionEvalValue*)script -> GetVariable(u"testFunc");
+    auto funcType = func -> GetType();
+    auto obj = new UserDataTestObject();
+    auto parameter = new UserDataValue(HashedString::ConstHash("testObject"), obj);
+    script->CallFunction(u"testFunc", {parameter});
+    REQUIRE(obj->fooVector[2] == 684);
+    delete obj;
+    delete parameter;
+    delete script;
+    delete func;
+    UserDataStorage::ClearTypes();
+}
+
 
 #endif