madscribes and online mentoring

I gave this talk at the monthly Seattle.rb meetup on 5/6/15. I talk about code from a Ruby on Rails game I've been working madscribes.com. I go over how we can use time ranges as hash keys and how to implement realtime chat with websockets. I then talk about my positive experiences with online mentoring.

Transcript

1. madscribes.com and Online Jr Dev Mentoring yolo
2. Hihihi Todd Jr Ruby on Rails Dev
3. getting married soon
4. Talk Outline madscribes game and code Online Jr dev mentoring with Sean
6. How to play Create or subscribe to a story Each person submits a sentence Vote on the sentence you like Highest voted sentence is added to story
7. Demo Live demo!
9. Trivia Name movie reference Hint: Jonny Lee Miller and Angelina Jolie
11. Random Fact #1 secret to increase productivity
12. Secret to 5000% Productivity Code to Hackers soundtrack
13. Reflection Code from pairing with Sean Online Jr dev mentoring
14. Ranges
15. Range Objects Need <=> First and last objects comparable with <=> (10 <=> 20) == -1 (20 <=>10) == 1 (10 <=> 10) == 0
16. Does this Range Contain x? Is Moooooorgan here?
17. Range: include? vs cover? include? numerics: compares first and last values <=> O(1) iterates over each value O(n) cover? compares first and last values <=> O(1)
18. Hashes Can use any object as keys symbols, strings, numbers, time, etc How about using time ranges as keys?
19. Hash with Time Range h = {Time.now.yesterday..Time.now.tomorrow => "Gumby Time”} h.find { |time_range, _| time_range.cover? Time.now} “Gumby Time”
20. Trivia Why can’t we use include? on a time range?
21. Since 1.9.2 Time.succ is Obsolete Range#include? requires succ implemented 1.succ == 2 Date.today.succ == Date.tomorrow Time.new(1).succ != Time.new(1) + 1 include? can’t treat Time as numeric and use <=>
22. Creating Rounds Hash
23. Hash with Time Range
24. Websockets Server can send browser data without being asked Acts like HTTP message then upgraded Offers encryption Rails 5 support through mysterious Action Cable
25. Implementation github.com/ngauthier/tubesock Postgres Notify and Listen Puma multi-threaded web server
26. HTML
27. Javascript
28. Controller
31. Not webscale!!!
32. f
33. Improvements Single thread for db connection to notify all subscribers @subscribers hash holds code blocks to be run on notify Mutex prevents multiple database listen threads
34. What’s a Mutex Mutex otherwise known as a semaphore Forces block of code to run sequentially Comparable to database locking Without mutex, threads can update shared variables
37. End Result Two threads per web socket One is listening for browser messages One is sending keep-alive pings One thread for database listening Ability to fit on a free Heroku instance
38. Code on Github github.com/tlynam/madscribes Feel free to send pr’s or issues Play a game sometime!
39. Online Mentoring Met Sean on codementor Build all the skill sets
40. Mentoring Plan Code Review Pair Special topics ‘review the source’
41. Nice Alt to Bootcamp 1:1 Flexibility Focus on desired topics Downside: lack of networking
42. Thank you :D Let’s chat! tlynam@gmail.com @tlynam (hire me)