Bank Technical Test

My approach

My approach was to break the brief into user stories. There seems to be one clear object in the brief - a Bank. This will be my main object.

Within this bank, users should be able to do three things

• Deposit
• Withdraw
• Print statement

For Deposits and Withdrawals, a user should be able to insert a number, that will either add or detract from the 'Bank Balance' (the balance should be an instance variable so that is can be constantly updated). In addition to the balance, the date of each deposit or withdrawal should also be taken into account and updated through another instance variable 'Date'.

Each time the user interacts with the bank, an element will be added to the 'bank statement' this should be an array so that it can hold a 2D array. On the first level of the array, this will be each interaction with the bank (withdrawals and deposits). On the second level for line, there should be 4 elements which stores a date, credit amount, debit amount and a snapshot of the balance at that point in time - these four components will make up the bank statement.

The function print statement will introduce headings "date, credit, debit and balance", as well as reversing the array so that the most recent activity is at the top. Below that, the itemized lines of the bank history - this is the generateStatement() function.

To run the project:

Please open this up on a browser CLI e.g Google Chrome dev tools.

$ var bank = new Bank Initialize the bank object
$ bank.deposit(100) Deposit into the bank
$ bank.deposit(50) Withdraw from the bank
$ bank.printStatement() Print bank statement

To run tests

Please open SpecRunner.html on a browser

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 withdrawal 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

User Stories:

• As a user So that I can add money to my bank account I would like to deposit cash into my bank account

• As a user So that I can use cash to spend I would like to withdraw cash from my bank account

• As a user So that I can see how much cash I have I would like to be able to print my bank statement

• As a user So that I can see what dates my deposits were made I would like to be able to see the dates on my bank statement

Domain modelling

Object	Name	Purpose
Class	Bank
	Deposit()	To add to total bank balance
	Withdraw()	To minus from bank balance
	Print()	To print the history of withdrawals/deposits

User flow