Bank Tech Test

Requirements

• Interact with your code via the JavaScript console.
• 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

How to run

• Clone the repository
• Run npm install
• Run npm test to see tests or open the specRunner.html
• Open specRunner.html and open the console to enter commands
• Enter let account = new Account('Jasmine') to create an account
• Enter account.transaction(500.00, 'credit') to add a transaction
• Enter account.transaction(250.00, 'debit') to add a further transaction
• Enter account.printStatement() to see the printout

Refactoring After Review

• I extracted the Transaction and Statement classes from the single class, Account that was managing everything. Account would then call upon these classes for functionality.
• Account itself would be accessed from the BankInterface class which is what the user will interact with.
• I made sure to store transactions as numerical values instead of text so that they could be referenced later.
• I made it so that the account.balance was only stored in one place, the _accountHistory array.
• Through the refactoring I removed the possibility of erroneous transaction types by hard coding the types into the credit and debit functions of the Account class.
• I updated the feature test to demonstrate the Acceptance Criteria.

Original Approach to Task

• I originally started trying to create a Bank class which created separate objects of another class, Account, but found the bank class would just be calling account all the time so removed it.
• I envisioned the Account would start with an account name, but this is superfluous really, an empty account history Array and an empty balance.
• Simple if statements determine the kind of transaction and these are then returned as strings to 2 decimal places.
• The date is added using the Date() function, this is trimmed to exclude the time aspect that is returned by Date() and then hyphens are replaced with forward slashes, the format is reversed to dd/mm/yyyy.
• The print statement function needs to return a console.log() for each of the transactions in the history, so it will loop through them all and use object destructuring to easily access the data for the template literal output.

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Test Coverage

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Testing Results

Used Packages

• eslint for linting
• babel as a parser for eslint
• jasmine for a testing library
• karma as a framework for testing with chrome remotely for CI integration
• istanbul for coverage, ran inside the karma framework