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This coding exercise comes from Upcase, the online learning platform we run. It's part of the Refactoring course and is just one small sample of all the great material available on Upcase, so be sure to visit and check out the rest.
If there's a group of expressions (or even a single expression) whose intention can be better described with a single, concise name, it's a sign that it can be extracted as a method.
In this exercise, you'll find several opportunities to do exactly that.
If you like, you can watch an example from The Weekly Iteration.
To start, you'll want to clone and run the setup script for the repo
git clone git@github.com:thoughtbot-upcase-exercises/extract-method.git
cd extract-method
bin/setup
Within the print method of the ReceiptPrinter class, extract some code out as methods.
Remember to:
- Give each method a name that best describes its role within
print; - Run the tests via
raketo make sure they're all still passing.
Check out the featured solution branch to see the approach we recommend for this exercise.
If you find yourself stuck, be sure to check out the associated Upcase Forum discussion for this exercise to see what other folks have said.
When you've finished the exercise, head on back to the Refactoring course to find the next exercise, or explore any of the other great content on Upcase.
extract-method is Copyright © 2015-2018 thoughtbot, inc. It is free software, and may be redistributed under the terms specified in the LICENSE file.
This exercise is maintained and funded by thoughtbot, inc.
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