Class:
- Class – is a collection of variables and methods
- Variables – Store information
- Methods – Process information
Object:
- Real world entity (Human, House, Car, Laptop, Mobile….)
- Object – memory allocation of class.
Banking Application: Account class – Number of Account Holders (objects)
Constructor():
- We create object to class using “new” operator
- “new” operator allocates memory to variables.
- To provide initial values to variables we use constructor.
- “this” is used to point an object.
Create Object and Print details:
<!doctype html>
<html>
<body>
<script>
class Account{
constructor(num, name, balance){
this.num = num;
this.name = name;
this.balance = balance;
}
}
var e = new Account(101, "Amar", 5000);
document.write("Num : " + e.num + "<br/>");
document.write("Name : " + e.name + "<br/>");
document.write("Balance : " + e.balance + "<br/>");
</script>
</body>
</html>
Create multiple objects and print details using method:
<!doctype html>
<html>
<body>
<script>
class Account{
constructor(num, name, balance){
this.num = num;
this.name = name;
this.balance = balance;
}
details(){
document.write("Num : " + this.num + "<br/>");
document.write("Name : " + this.name + "<br/>");
document.write("Balance : " + this.balance + "<br/>");
}
}
var e1 = new Account(101, "Amar", 5000);
var e2 = new Account(102, "Harin", 7000);
var e3 = new Account(103, "Annie", 9000);
e1.details();
e2.details();
e3.details();
</script>
</body>
</html>