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extract-method's Introduction

Refactoring / Extract Method

Hey there! We're thoughtbot, a design and development consultancy that brings your digital product ideas to life. We also love to share what we learn.

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.

Exercise Intro

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.

Instructions

To start, you'll want to clone and run the setup script for the repo

git clone [email protected]: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 rake to make sure they're all still passing.

Featured Solution

Check out the featured solution branch to see the approach we recommend for this exercise.

Forum Discussion

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.

Next Steps

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.

License

extract-method is Copyright © 2015-2018 thoughtbot, inc. It is free software, and may be redistributed under the terms specified in the LICENSE file.

Credits

thoughtbot

This exercise is maintained and funded by thoughtbot, inc.

The names and logos for Upcase and thoughtbot are registered trademarks of thoughtbot, inc.

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