diff --git a/javascript/Day30/index.js b/javascript/Day30/index.js
index adbc577..932f3ca 100644
--- a/javascript/Day30/index.js
+++ b/javascript/Day30/index.js
@@ -35,7 +35,7 @@ function printTable(value) {
 }
 
 let x = 2;
-
+var y = 3;
 printTable(x);
 printTable(y);
 printTable(4);
diff --git a/javascript/Day31/index.js b/javascript/Day31/index.js
new file mode 100644
index 0000000..a3d4418
--- /dev/null
+++ b/javascript/Day31/index.js
@@ -0,0 +1,38 @@
+var result = 6;
+
+function sum() {
+  console.log(result);
+  var two = 2;
+  var result = two + two;
+  return result;
+}
+
+sum();
+//undefined
+
+console.log(window.y);
+y = 20;
+
+console.log(window.y);
+
+function abc() {
+  x = 20;
+  var h = 30;
+  console.log(x, h);
+}
+
+abc();
+
+console.log(window.x);
+console.log(h);
+
+var xyz = function (name) {
+  console.log("Regular Function " + name);
+};
+
+const arrow_function = (name) => {
+  console.log("Arrow Function " + name);
+};
+
+arrow_function("Ahemad");
+xyz("utkarsh");