BankAccount Module

gistfile1.js

              var BankAccountModule = (function () {
                var balance = 0.;

                function _isEnoughMoney(amount) {
                    return balance > amount;
                }
                function deposit(amount) {
                    balance += amount;
                }
                function withdraw(amount) {
                    if (_isEnoughMoney(amount)) {
                        balance -= amount;
                    }
                }
                function getBalance() {
                    return balance;
                }
                return {
                    deposit: deposit,
                    withdraw: withdraw,
                    getBalance: getBalance
                };

            })();
            //Adds some money
            BankAccountModule.deposit(20.);
            //Prints balance
            console.log("balance = " + BankAccountModule.getBalance());