Oh, apologies - I got good feedback on the last Show HN and I wasn't aware of these rules!

This chapter will appear in the new Hello Web App: Intermediate Concepts book: https://hellowebapp.com/news/tutorial-setting-up-a-contact-f...

I also have a sample of the first book here: http://hellowebapp.com/sample

Sorry I missed those guidelines! Hopefully the above helps out.