Just as functions have local variables, which can be accessed only from inside a function. we can also have private variables in a class which we won’t share publicly.
if create a variable without using ‘this’ keyword in a constructor function, then it is a private variable.
ex :
function Person(name){
this.name = name;
var balance = 234;
}
var sur = new Person(“bob”);
console.log(sur.balance); // not accessible, gives undefined output
*** Even though we cannot access private variables directly, we can access them by using a public method. this method is very similar to access a private variable.
ex:
function Person(first,last,age) {
this.firstname = first;
this.lastname = last;
this.age = age;
var bankBalance = 7500;
this.getBalance = function() {
// your code should return the bankBalance
return bankBalance;
};
}
var john = new Person(‘John’,’Smith’,30);
console.log(john.bankBalance);
// create a new variable myBalance that calls getBalance()
var myBalance = john.getBalance();
console.log(myBalance);
A method can return another method inside a method.
ex:
this.askTeler = function(){
return returnBalance();
};
********** types of variables we are concerned with are ‘number’ ‘string’ and ‘object’