notes.md

transaction = { type: credit/debit amount: integer, date: dateNow(), balance: integer }

class BankAccount { constructor() { balance = 0; transaction history = []; transaction = {}; } deposit(amount) withdraw(amount) printStatement() }

Splitting the class

BankAccount { constructor(TransactionHistory) { balance = 0; transactionHistory = new TransactionHistory; }

deposit(amount) { transactionHistory.add('credit', amount) }

withdraw(amount) { transactionHistory.add('debit', amount) } }

TransactionHistory { constructor() { transactions = [] }

add(type, amount) { newTransaction(type, amount); this.transactions.push(newTransaction) }

newTransaction }

Input:

• deposit 1000 on 10/01/2023
• deposit 2000 on 13/01/2023
• withdrawal 500 on 14/01/2023

Output: date || credit || debit || balance 14/01/2023 || || 500.00 || 2500.00 13/01/2023 || 2000.00 || || 3000.00 10/01/2023 || 1000.00 || || 1000.00