old_contents: //This is An OOP Model of a bank account
  //OOP is suitable for when you have relatively 
  //few operations and and large data sets
  
  
  //Base account model implements the standard features 
  
  class Account {
  	constructor(name, age, amount) {
  		this._name = name;
  		this._age = age;
  		this._balance = amount;	
  	}
  
  	//deposit method for account class
  	deposit(amount){
  		this._balance += amount;
  		return "TRANSACTION SUCCESSFUL: You have deposited " + amount;
  	}
  
  	//withdraw method for account class
  	withdraw(amount){
  		if (amount < this._balance) {
  			this._balance -= amount;	
  			return "TRANSACTION SUCCESSFUL: You have withdrawn " + amount;
  		}
  		
  	}
  
  	//balance method for account class
  	balance(){
  		this._balance;
  		return "TRANSACTION SUCCESSFUL: You have " + this._balance + " in your account";
  	}
  }
  
  
  //export an instance 
  module.exports = {
  	Ade : new Account("Adeoluwa Adejumo", 5, 5000)
  	Victoria: new SavingsAcc("Victoria Offoma" 19, 50000)
  }
new_contents: //This is An OOP Model of a bank account
  //OOP is suitable for when you have relatively 
  //few operations and and large data sets
  
  
  //Base account model implements the standard features 
  
  class Account {
  	constructor(name, age, amount) {
  		this._name = name;
  		this._age = age;
  		this._balance = amount;	
  	}
  
  	//deposit method for account class
  	deposit(amount){
  		this._balance += amount;
  		return "TRANSACTION SUCCESSFUL: You have deposited " + amount;
  	}
  
  	//withdraw method for account class
  	withdraw(amount){
  		if (amount < this._balance) {
  			this._balance -= amount;	
  			return "TRANSACTION SUCCESSFUL: You have withdrawn " + amount;
  		}
  		
  	}
  
  	//balance method for account class
  	balance(){
  		this._balance;
  		return "TRANSACTION SUCCESSFUL: You have " + this._balance + " in your account";
  	}
  }
  
  
  class SavingsAcc extends Account {
  	super(name, age, amount) {
  	}	
  }
  
  
  //export an instance 
  module.exports = {
  	Ade : new Account("Adeoluwa Adejumo", 20, 5000),
  	Victoria: new SavingsAcc("Victoria Offoma", 19, 50000)
  }
subject: implement savings account class