March 6 - Integrate a Helper Module in Ruby
This guide walks through how to integrate Ruby modules in order to add custom helper methods to a class.
Guide Tasks
- Read Tutorial
- Watch Guide Video
- Complete the Exercise
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Summary
Build a module with helper methods and call the methods from a class.
Exercise Description
Build a helper module called InvoiceHelper that contains a method called taxable? that checks the source of an order and returns if it's taxable order or not. Then build a class called Sale that has a total and source attribute. Then build a method called place_order that returns the total plus a 6% tax rate if the source is AZ or online, and returns the total by itself if the source is any other value.
Example Input
s = Sale.new(500, 'AZ') s.place_order # => 530.0 s2 = Sale.new(500, 'TX') s2.place_order # => 500.0
Real World Usage
Building helper modules is an important task when it comes to code organization. This example is a practical case study on how you can add a boolean helper method to a class without having to clutter the class code.