diff --git a/array_copy.rb b/array_copy.rb
new file mode 100644
index 0000000..103cc4c
--- /dev/null
+++ b/array_copy.rb
@@ -0,0 +1,10 @@
+# array_copy.rb
+
+def array_changer array
+  array << 6
+end
+
+some_array = [1, 2, 3, 4, 5]
+p some_array
+array_changer Marshal.load(Marshal.dump(some_array))
+p some_array
diff --git a/array_passed_to_function.rb b/array_passed_to_function.rb
new file mode 100644
index 0000000..ee25a66
--- /dev/null
+++ b/array_passed_to_function.rb
@@ -0,0 +1,10 @@
+# array_passed_to_function.rb
+
+def array_changer array
+  array << 6
+end
+
+some_array = [1, 2, 3, 4, 5]
+p some_array
+array_changer some_array
+p some_array