@@ -13,5 +13,16 @@ greet(name)
 
 function add(a,b){
 console.log(a+b)
+return a+b
 }
-add(4,5), add(4,55), add(4,555)
+add(4,5), add(4,55), add(4,555)
+let x = add(3,43)
+console.log(x)
+
+
+//Function as expression
+let y = function (num) { return num*num}
+console.log(y(5))
+
+let z = y(3)
+console.log(z)

@@ -0,0 +1,25 @@
+// program to show the change in global variable
+let a = "hello";
+
+function greet() {
+a = 3;
+}
+
+// before the function call
+console.log(a);
+
+//after the function call
+greet();
+console.log(a); // 3
+
+// program showing local scope of a variable
+var a1 = "hello";
+
+function greet1() {
+let b = "World"
+a1 = "hellooo"
+console.log(a1 + b);
+}
+
+greet1();
+//console.log(a1 + b); // error