Here you can find (one possible) solution to this chapter's challenges. (download the "Lesson Materials" below)

Please refer to them only if you are stuck or want to cross-check your own solution.

Remember, champions don't cheat. :-)

Lesson Materials
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Introduction
Checkpoint Q&A #1
Checkpoint Q&A #2
Checkpoint Q&A #3
Checkpoint Q&A #4
Reuse Functionality between Application Modules (cont.)