diff --git a/index.js b/index.js
index e69de29bb..d4af3f765 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,31 @@
+var num = 10
+function add(num) {
+  num += 5
+}
+
+
+var num = 15;
+function subtract(num) {
+  num -= 2;
+}
+
+
+var num = 5 ;
+function multiply(num) {
+  num * 5;
+}
+
+
+var num = 50;
+function divide(num) {
+  num /= 2;
+}
+
+
+var a = 5
+var b = 10
+
+function sum(a, b) {
+  var new = a + b
+  return new;
+}