User Stories

• In a bank you have business accounts and private accounts.
• You can transfer money between accounts using transactions.
• For private accounts the transaction fee is 0.01 € for business accounts the transaction fee is 0.02 €.

Tasks

• write an Account class
  • The class should hold a reference to the ledger
  • It should also have a name to identify the account
• implement a Transaction class
  • A transaction consists of an optional sender (Type: Account)
  • receiver (Type: Account)
  • amount (Type: Number)
  • reference (Type: String)
• implement a Ledger class that keeps all transactions
  • It should keep an array of transactions
  • Have a member variable bankAccount the keeps a reference for the bank account
  • Implement a function addTransaction(transaction)
  • Implement a function calculateAmountForAccount(account) using reduce
  • Implement a function findTransactionsForAccount(account) using filter
• Add convenience functions to Account
  • add a send function that generates two transactions
    • The actual transaction
    • A transaction for the fee for the bank
  • add a getter to calculate the amount
  • add a getter to retrieve all transactions that are related to the account
• specialize Account class into a BusinessAccount
  • override the send function to respect different transaction fees for businesses

Help

You can see the tests in integration-test. Try to run write the classes so they are satisfying the tests. You can also follow the commits in the solution branch to see the solution.

Commands

npm install # install all dependencies
npm test # runs all tests
npm start # starts a dev server on localhost:8000