Original author of examples is Mark McGranaghan from Seattle, WA.
I'd like to retype his examples myself to memorize it better.
I left it Public, because I made some small changes to some of original examples just to learn myself, perhaps, someone finds it useful.
Original examples are nicely displayed at this website: https://gobyexample.com
It's repository located here: https://github.com/mmcgrana/gobyexample
This work is copyright Alex Teterkin and licensed under a Creative Commons Attribution 3.0 Unported License.