/bank_tech_test_js

Primary LanguageJavaScript

Bank Tech Test

Banking Application, created with JavaScript and Jasmine (testing framework), using BDD, TDD and OOP principles.

Requirements

  • You should be able to interact with your code via a REPL like IRB or the JavaScript console. (You don't need to implement a command line interface that takes input from STDIN.)
  • Deposits, withdrawal.
  • Account statement (date, amount, balance) printing.
  • Data can be kept in memory (it doesn't need to be stored to a database or anything).

Acceptance Criteria

Given a client makes a deposit of 1000 on 10-01-2012
And a deposit of 2000 on 13-01-2012
And a withdrawl of 500 on 14-01-2012
When she prints her bank statement
Then she would see:

date || credit || debit || balance
14/01/2012 || || 500.00 || 2500.00
13/01/2012 || 2000.00 || || 3000.00
10/01/2012 || 1000.00 || || 1000.00

The Application

The project can be found here: https://github.com/SecretSurfSpot/bank_tech_test_js

Installation

  • Clone the repo to your local machine: git clone https://github.com/SecretSurfSpot/bank_tech_test_js.git

Testing

To test the application:

  • Navigate to the project root (bank_tech_test_js)
  • In the project root execute open -a "Google Chrome" SpecRunner.html
  • Interact with the application via the Chrome Console cmd+alt+j and run the following commands:
  • Bank_Acc = new BankAccount(); creates a new BankAccount object
  • Bank_Acc.makeDeposit(1000); deposits £1000
  • Bank_Acc.makeDeposit(2000); deposits £2000
  • Bank_Acc.makeWithdrawal(500); withdraws £500
  • Bank_Acc.printStatement prints a bank statement, as per the format shown in the Acceptance Criteria section (and screenshot below)

The above commands result in the output below:

Chrome Console Screenshot

Domain Model

The model below illustrates the high-level structure of the application.

Two main objects (constructor functions):

  1. BankAccount: Takes inputs for both deposit and withdrawal amounts, keeps track of the balance and also maintains the transaction log
  2. Printer: Takes the transactions as input (from the BankAccount constructor function's function: BankAccount.printStatement()), formats the statement and then prints it
    User
╔═════════════╗  
║             ║ Interacts with application
║  Browser    ║ via REPL, e.g. Chrome Console (cmd+alt+j)     
║             ║
╚═════════════╝
       |
       |
       |                                   
╔═════════════╗     
║             ║ public functions:  makeDeposit, makeWithdrawal & printStatement
║ BankAccount ║                  
║(constructor)║ private functions: _addTransaction, _isInputANumber,            
╚═════════════╝                    _isNumberPositive & _getFormattedDate    
       |
       |
       V                             
╔═════════════╗
║             ║ public function:  printStatement
║   Printer   ║                  
║(constructor)║ private functions: _statementHeader & _reverseArray
╚═════════════╝