diff --git a/C++/Memory.Aux.cpp b/C++/Memory.Aux.cpp
deleted file mode 100644
index af6888e..0000000
--- a/C++/Memory.Aux.cpp
+++ /dev/null
@@ -1,16 +0,0 @@
-#include <map>
-#include "Memory.h"
-
-std::map<int, int> memory_generateConstPlayfield(
-  int n
-) {
-  std::map<int, int> idGroups;
-  auto id = 0;
-  for (int gid = 0; gid < n; ++gid) {
-    idGroups[id] = gid;
-    id += 1;
-    idGroups[id] = gid;
-    id += 1;
-  }
-  return idGroups;
-}
diff --git a/C++/main.cpp b/C++/main.cpp
deleted file mode 100644
index 404e5ee..0000000
--- a/C++/main.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-#include "Memory.h"
-#include <iostream>
-
-int main() {
-  std::cout
-    << test_memory_generateConstPlayfield()
-    << std::endl;
-}
diff --git a/C++/Memory.Test.cpp b/Memory.Test.cpp
similarity index 100%
rename from C++/Memory.Test.cpp
rename to Memory.Test.cpp
diff --git a/C++/Memory.h b/Memory.h
similarity index 100%
rename from C++/Memory.h
rename to Memory.h
diff --git a/gen-C++ b/gen-C++
index 5167d64..cbf52cd 100755
--- a/gen-C++
+++ b/gen-C++
@@ -1,6 +1 @@
-c++ -o test_memory_C++ \
-  -std=c++11 \
-  -IC++ \
-  C++/Memory.Aux.cpp \
-  C++/Memory.Test.cpp \
-  C++/main.cpp
+c++ -o test_memory_C++ -std=c++11 main.cpp
diff --git a/gen-JavaScript b/gen-JavaScript
new file mode 100755
index 0000000..134379b
--- /dev/null
+++ b/gen-JavaScript
@@ -0,0 +1,2 @@
+echo "node main.js" > test_memory_JavaScript
+chmod +x test_memory_JavaScript
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..add1041
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,35 @@
+#include <map>
+#include <string>
+
+std::map<int, int> memory_generateConstPlayfield(
+  int n
+) {
+  std::map<int, int> idGroups;
+  auto id = 0;
+  for (auto gid = 0; gid < n; ++gid) {
+    idGroups[id] = gid;
+    id += 1;
+    idGroups[id] = gid;
+    id += 1;
+  }
+  return idGroups;
+}
+
+std::string test_memory_generateConstPlayfield() {
+  auto idGroups = memory_generateConstPlayfield(2);
+  if (
+    idGroups.size() == 4 &&
+    idGroups[0] == 0 &&
+    idGroups[1] == 0 &&
+    idGroups[2] == 1 &&
+    idGroups[3] == 1
+  ) {
+    return "OK: memory_generateConstPlayfield";
+  }
+
+  return "ERR: memory_generateConstPlayfield";
+}
+
+int main() {
+  printf("%s\n", test_memory_generateConstPlayfield().c_str());
+}
diff --git a/main.js b/main.js
new file mode 100644
index 0000000..6f2559c
--- /dev/null
+++ b/main.js
@@ -0,0 +1,31 @@
+function memory_generateConstPlayfield(
+  n
+) {
+  var idGroups = {};
+  var id = 0;
+  for (let gid = 0; gid < n; ++gid) {
+    idGroups[id] = gid;
+    id += 1;
+    idGroups[id] = gid;
+    id += 1;
+  }
+
+  return idGroups;
+}
+
+function test_memory_generateConstPlayfield() {
+  let idGroups = memory_generateConstPlayfield(2)
+  if (
+    Object.keys(idGroups).length == 4 &&
+    idGroups[0] == 0 &&
+    idGroups[1] == 0 &&
+    idGroups[2] == 1 &&
+    idGroups[3] == 1
+  ) {
+    return "OK: memory_generateConstPlayfield"
+  }
+
+  return "ERR: memory_generateConstPlayfield"
+}
+
+console.log(test_memory_generateConstPlayfield())