This is the second time visiting this Dojo. The first time we implemented a basic bank account, with the ability to create an account, add funds, and remove funds. The original README can be found in the file 2014-02-19-README.md.
This time around, we are going to add a few more key features of bank accounts:
- Compound interest
- Transfers between accounts
# Let's create an instance of our object with $500
ba = BankAccount.new(500)
=> #<BankAccount:0x007fb740be4818>
# We can add funds, let's add $100
ba.add_funds(100)
=> #<BankAccount:0x007fb740be4818>
# Great, now let's check out balance
ba.balance
=> #<Money fractional:60000 currency:USD> # $600
# We can also take money out, let's remove $50
ba.withdraw(50)
=> #<Money fractional:5000 currency:USD># Turns the number 10 into $10
x = 10.to_money
# Turns the number 10 into $0.10
Money.new(10)
# Can do arithmetic on Money objects
x * 2
=> #<Money fractional:2000 currency:USD>
x < 15
=> true
# Can get the number of cents from Money objects (to store as an integer, perhaps)
x.cents
=> 1000# BankAccount.new(initial_amount, interest)
ba = BankAccount.new(500, 0.02) # 2% interest
=> #<BankAccount:0x007fb740be4818># calculate_interest(months)
ba.calculate_interest(1)
=> #<Money fractional:1000 currency:USD> # returns the interest earned, $10
# add_interest(months)
ba.add_interest(1)
=> #<Money fractional:51000 currency:USD> # returns the balance, $510# Initialize the other bank account
ba2 = BankAccount.new(100, 0.01)
# BankAccount.transfer(from_account, to_account, amount)
BankAccount.transfer(ba, ba2, Money.new(100)) # transfer $100 from account ba to account ba2
=> true
ba.balance
=> #<Money fractional:41000 currency:USD> # $410
ba2.balance
=> #<Money fractional:20000 currency:USD> # $200