Today, you'll practice doing a tech test.
For most tech tests, you'll essentially have unlimited time. This practice session is about producing the best code you can when there is a minimal time pressure.
You'll get to practice your OO design and TDD skills.
You'll work alone, and you'll also review your own code so you can practice reflecting on and improving your own work.
As a customer, So that I can save money. I want to open a bank account with a deposit
As a customer, So that I can continue adding to my savings, I want to be able to deposit into my back account
As a customer, So that I can spend my money that I've saved, I want to be able to withdraw money from my bank account.
As a customer, So that I can keep track of what I'm spending, I want to be able to print out a statment of my spending with dates.
Class: Account
Methods: .deposit
.withdraw
.statement
Input: || Output:
account.deposit(100) => 100
account.withdraw(50) => 50
account.withdraw(1000) => "Your withdrawal exceeds your current balance."
account.statement => date || credit || debit || balance
11/08/2020 || || 50 || 50
11/08/2020 || 100 || || 100
V1
V2
V3
My approach was to build a simple program and then spread out the separate methods into classes. I started with the creation of the account class then moved into creating the deposit, withdraw and statement methods. I did also create a statement class but at the time of writing, this is a WIP.
I had the most trouble with my statement method where most of my focus was kept. This was due to multiple factors such as returning the statement correctly as well as trying various different things to get the statement to appear in the correct format.
I structured the code to be easily readable and to have 93.75% test coverage. But I also structured it in a way that it can allow for easy moving to other classes.
- Fork or Clone this repo.
- Run bundle install.
- Run 'irb' in your console.
- In the console type; require './lib/account.rb'
- Then to create a new account type; account = Account.new
- At this stage you have several commands, 'account.deposit(amount), account.withdraw(amount), account.statement'
- Fork or Clone this repo.
- Run bundle install.
- Run rspec in file to see tests.
- 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).
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
Once you have completed the challenge and feel happy with your solution, here's a form to help you reflect on the quality of your code: https://docs.google.com/forms/d/1Q-NnqVObbGLDHxlvbUfeAC7yBCf3eCjTmz6GOqC9Aeo/edit