Closure in JavaScript

closure is same as Encapsulation java.
Global variables can be made local (private) with closures.

 function bank(){
            let balance=500;

            const service={
                deposit : function(amt){
                    balance+=amt;
                    console.log(balance);
                },
                withdraw : function(amt){
                    balance-=amt;
                    console.log(balance);
                },
                viewbalance : function(){
                    console.log(balance);
                }
            }

            return service;
        }
        const person1= bank();
        person1.deposit(1000);
        const person2=bank();
        person2.withdraw(3000);
        const person3=bank();
        person3.viewbalance();

output:

1500
-2500
500