Scoping

section2/script.js

+/////////////////////////////////////
+// Lecture: Hoisting
+/*
 calculateAge(1988);
 
 function calculateAge(year){
@@ -9,5 +12,39 @@ var calculateAge2 = function(year){
 calculateAge2(1988)
 console.log(x);
 var x=23
+*/
+
+
+/////////////////////////////////////
+// Lecture: Scoping
+
+
+// First scoping example
+var a = 'Hello!';
+first();
+function first() {
+    var b = 'Hi!';
+    second();
+    function second() {
+        var c = 'Hey!';
+        console.log(a + b + c);
+    }
+}
+// Example to show the differece between execution stack and scope chain
+var a = 'Hello!';
+first();
+function first() {
+    var b = 'Hi!';
+    second();
+    function second() {
+        var c = 'Hey!';
+        third()
+    }
+}
+function third() {
+    var d = 'John';
+    //console.log(c);
+    console.log(a+d);
+}