diff --git a/JavaScript.xlsx b/JavaScript.xlsx
index aaee558648bd5efef710103ad48cff77ae81afeb..f3303b9a8e24cc6b19edccf6dabd44e59035d0d7 100644
Binary files a/JavaScript.xlsx and b/JavaScript.xlsx differ
diff --git a/js/es6/es6/let_count.js b/js/es6/es6/let_count.js
new file mode 100644
index 0000000000000000000000000000000000000000..70c9aa5542d12420fdab268381b37ada05045746
--- /dev/null
+++ b/js/es6/es6/let_count.js
@@ -0,0 +1,5 @@
+function f() { console.log('I am outside!'); }
+
+(function () {
+  f();
+}());
\ No newline at end of file