diff --git a/src/compiler.c b/src/compiler.c
index 5a71b59..59c1ea8 100644
--- a/src/compiler.c
+++ b/src/compiler.c
@@ -64,6 +64,11 @@ void compile_node(compiler* self, node* root, program* prog)
 			compile_children(self, root, prog);
 			program_add_instr(prog, OP_CAT, NO_PARAM);
 		}
+		else if (lhs == rhs && lhs == TY_ARRAY)
+		{
+			compile_children(self, root, prog);
+			program_add_instr(prog, OP_ACAT, NO_PARAM);
+		}
 		else
 		{
 			compile_number(self, root, prog, OP_IADD, OP_FADD);
diff --git a/src/cstatic.c b/src/cstatic.c
index fc34ad7..73b21a1 100644
--- a/src/cstatic.c
+++ b/src/cstatic.c
@@ -70,15 +70,7 @@ type* cstatic_resolve_new(cstatic* self, node* ast)
 
 	else if (ast->type == NODE_ADD)
 	{
-		int lhs = cstatic_resolve_base_type(self, ast->children.data[0]); 
-		int rhs = cstatic_resolve_base_type(self, ast->children.data[1]); 
-
-		if (lhs == TY_STRING && rhs == TY_STRING)
-		{
-			return cstatic_new_type(self, TY_STRING);
-		}
-
-		return cstatic_new_type(self, lhs);
+		return cstatic_resolve_new(self, ast->children.data[0]);	
 	}
 
 	else if (ast->type == NODE_STRING)
@@ -213,6 +205,24 @@ int cstatic_check(cstatic* self, node* ast, char* msg, size_t size)
 
 		return 1;
 	}
+	
+	// Array Operations
+	if (ast->type == NODE_ADD)
+	{
+		type* lhs = cstatic_resolve_new(self, ast->children.data[0]);
+		type* rhs = cstatic_resolve_new(self, ast->children.data[1]);
+
+		if (lhs->base_type == TY_ARRAY
+			&& type_equals(lhs, rhs))
+		{
+			type_free(lhs); free(lhs);
+			type_free(rhs); free(rhs);
+			return 1;
+		}
+
+		type_free(lhs); free(lhs);
+		type_free(rhs); free(rhs);
+	}
 
 	// String Operations
 	if (ast->type == NODE_ADD)
diff --git a/src/opcodes.h b/src/opcodes.h
index 848d375..9d4c289 100644
--- a/src/opcodes.h
+++ b/src/opcodes.h
@@ -29,7 +29,8 @@
 	G(OP_CAT), \
 	G(OP_SMUL), \
 	G(OP_MKARRAY), \
-	G(OP_ADEREF)
+	G(OP_ADEREF), \
+	G(OP_ACAT)
 
 enum Opcodes {
 	OPCODES(GEN_ENUM)
diff --git a/src/vm.c b/src/vm.c
index 411d7a7..3b4c682 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -71,6 +71,7 @@ void vm_exec(vm* self, program* prog)
 
 			case OP_MKARRAY: vm_mkarray(self, param); break;
 			case OP_ADEREF: vm_aderef(self); break;
+			case OP_ACAT: vm_acat(self); break;
 
 			default: {
 				fprintf(stderr, "unknown opcode %s\n",
@@ -620,3 +621,38 @@ void vm_aderef(vm* self)
 
 	self->pc++;
 }
+
+void vm_acat(vm* self)
+{
+	assert(self);
+	
+	value* rhs = vm_pop_value(self);
+	value* lhs = vm_pop_value(self);
+	
+	array* lhs_arr = lhs->val.array_val;
+	array* rhs_arr = rhs->val.array_val;
+	
+	array result_arr;
+	array_init(&result_arr, lhs->type->array_type);
+
+	for (size_t i=0; i<lhs_arr->children.size; i++)
+	{
+		array_push(&result_arr, lhs_arr->children.data[i]);
+	}
+
+	for (size_t i=0; i<rhs_arr->children.size; i++)
+	{
+		array_push(&result_arr, rhs_arr->children.data[i]);
+	}
+
+	value* result = malloc(sizeof(value));
+	value_init_array(result, &result_arr, lhs->lineno);
+
+	array_free(&result_arr);
+	value_free(lhs); free(lhs);
+	value_free(rhs); free(rhs);
+	
+	vm_push_value(self, result);
+
+	self->pc++;
+}
diff --git a/src/vm.h b/src/vm.h
index 69ac1b0..4eae76d 100644
--- a/src/vm.h
+++ b/src/vm.h
@@ -55,5 +55,6 @@ void vm_cat(vm* self);
 void vm_mkarray(vm* self, int param);
 
 void vm_aderef(vm* self);
+void vm_acat(vm* self);
 
 #endif
diff --git a/tests/err_ty_array.wuz b/tests/err_ty_array.wuz
index 5132e49..862288a 100644
--- a/tests/err_ty_array.wuz
+++ b/tests/err_ty_array.wuz
@@ -6,3 +6,5 @@
 [1, 2, 3][3.14]
 [1, 2, 3][ [0, 1] ]
 [1, 2, 3][0, 0]
+[1] + 1
+[[1, 2]] + [1]
diff --git a/tests/test_array.wuz b/tests/test_array.wuz
index a5dab54..cd90d22 100644
--- a/tests/test_array.wuz
+++ b/tests/test_array.wuz
@@ -16,8 +16,7 @@ assert "8" == ["3", "8", "9"][2 - 1]
 assert 7 == [[4, 6], [9, 2, 7], [3, 3, 2]][1, 2]
 assert 9 == [[4, 6], [9, 2, 7], [3, 3, 2]][[2, 9, 1][2], 0]
 
-
-
-
-
+assert [1, 2] == [1] + [2]
+assert [3, 4, 5, 6] == [3] + [4] + [5, 6]
+assert [[2, 4], [6, 8]] == [[2, 4]] + [[6, 8]]