Variable mutation and type coercion

script.js

 /*****************************
 * Variables and data types
 */
-
+/*
 var firstName = 'John';
 console.log(firstName);
 var lastName = 'Smith';
@@ -15,5 +15,25 @@ console.log(job);
 // Variable naming rules
 var _3years = 3;
 var johnMark = 'John and MArk';
+*/
+
+
+/*****************************
+* Variable mutation and type coercion
+*/
 
+var firstName = 'John';
+var age = 28;
+// Type coercion
+console.log(firstName + ' ' + age);
+var job, isMarried;
+job = 'teacher';
+isMarried = false;
+console.log(firstName + ' is a ' + age + ' year old ' + job + '. Is he married? ' + isMarried);
+// Variable mutation
+age = 'twenty eight';
+job = 'driver';
+alert(firstName + ' is a ' + age + ' year old ' + job + '. Is he married? ' + isMarried);
+var lastName = prompt('What is his last Name?');
+console.log(firstName + ' ' + lastName);