If you have reached this point in the book, probably you will have worked through some of the examples, looked at the Julia modules that are useful to you, and written some of your own code.
Possibly you will want to package your code in a module and share it with the Julia community. Alternatively, you may want to work within a community group that develops and maintains existing packages and adds new ones.
When sharing your code and working with others, it is important to bear in mind that the source will be looked at and possibly mentored, so certain questions of style, efficiency, and testing come more into play.
This final chapter addresses some of these topics and will hopefully start you a long and fruitful romance ...