print_balance DRY version (credit: Pragmatic Programmer)

print_balance_dry.rb

def format_amount(value)
  result = sprintf("%10.2f", value.abs) 
  if value < 0
    result + "-" 
  else
    result + " " 
  end
end

def print_line(label, value)
  printf "%-9s%s\n", label, value
end

def report_line(label, amount)
  print_line(label + ":", format_amount(amount))
end

def print_balance(account) 
  report_line("Debits", account.debits) 
  report_line("Credits", account.credits) 
  report_line("Fees", account.fees) print_line("", "———-") 
  report_line("Balance", account.balance)
end