Hands-On Design Patterns and Best Practices with Julia

Referencing symbols defined in sub-modules

To begin, we can finish our implementation of the Mortgage sub-module with a real implementation of the payment function.

Let's see how this works:

1. The payment function takes a loan amount, an annual interest rate, the number of years for the loan, and calculates the monthly payment of the loan, as shown in the following code:

# Mortgage.jlmodule Mortgagefunction payment(amount, rate, years)    monthly_rate = rate / 12.0    factor = (1 + monthly_rate) ^ (years * 12.0)    return amount * (monthly_rate * factor / (factor - 1))end end # module

2. At this point, the Calculator module should be able to use the Mortgage sub-module as if it's yet another module, except that the notation to get access to the sub-module ...