- You should be able to interact with your code via a REPL like IRB or Node. (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).
Given a client makes a deposit of 1000 on 10-01-2023
And a deposit of 2000 on 13-01-2023
And a withdrawal of 500 on 14-01-2023
When she prints her bank statement
Then she would see
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
Started by developing user stories to understand the full scale of the requirements, and selected the most recurring and relevant verbs and nouns.
A class system was designed, taking into consideration the required input and output, and how the user would interact with the program.
I chose a two-class system for this challenge; the responsbility of Account is to handle and store the transactions. The responsibility of Statement is to print out the statement in the required format. This is to make it easier to change the format of the statement when required (for instance, if statements are required in the USA, the date format can be amended appropriately). It also means that statements can be printed for multiple accounts without the need to repeat code.
The user stories, diagram, and full design can be found here: https://github.com/rachelnewby/bank-tech-test/blob/main/docs/bank-tech-test-design-recipe.md
This program was built in JavaScript and uses the Jest test suit. It requires the following
nvm use node
npm add jest
npm install -g jest
To run the code:
- Run node in the terminal
- Require the Account class
const Account = require('./lib/account'); - Require the Statement class
const Statement = require('./lib/statement'); - Create new instances of each:
const account = new Account;const statement = new Statement(account); - You can now use the methods to perform the tasks you want (see below for function details)
.deposit(n)takes a number as an argument to deposit that amount. This must be a number and it cannot have more than 2 decimal numbers..withdraw(n)takes a number as an argument to withdraw that amount. This must be a number and it cannot have more than 2 decimal numbers. If you have not deposited any money into the account, or if you are trying to withdraw a number which exceeds the current balance, you will be thrown an error.
- This class requires an instance of account.
.print()will print the statement of your account transactions.
No dependencies were used. I contemplated including jest-extension but I found I could use the matchers without relying on the extension and therefore decided against it.
