RubyConf 2015 Notes

notes.md

Day 1

ORM Talk

• Use Bullet
• ActiveRecord breaks SRP

How to write good gems

• Quick Start
• Long README
• Never do breaking changes if possible and use semantic versioning
• Support as many versions as possible
• Gemnasium - Auto keep track of your Gemfile's dependencies
• wwtd - Replicate Travis CI config locally
• Appraisals - Generate multiple sets of Gemfiles to use against Travis CI
• vagrant up && bundle && rake test must just work
• Rubocop - Enforce code style rules
• Rubyflow - Give publicity to a gem

Closing keynote day 1

• Worst. Ideas. Evar - By Aaron Patterson
• Array#permutations
• Docker & Kubernetes
• Google Cloud with Ruby
• Rinda (Linda on Ruby)

Day 2

Opening Keynote

• Build great partnerships

Code culture and the pursuit of happiness

• DHH, "I wanted a life beyond work"
• Google - Unconscious bias

Pitfalls of gem dependencies

• Audit security of the gems you use (Hakiri)
• Breakmen - Find security vulnerabilities

Legacy code

(Didn't watch, but probably should)

Climbing the walls

• Re-fucking-watch!

Work/life balance

• Take time off! - Duh

Ruby ENV

• GEM_PATH - ENV var to lookup for gems

Git talk

• Small PRs
• LiceCAP to add gifs to PRs

DSLs

• Limit the scope of DSLs to make people hate you less

Day 3

Keynote

• Whitespace as dots
• Auto-indent
• Ruby blocks

How to performance

• RubyProf - CallStackPrinter
• StackProf
• AllocationTracer
• RubyVM.stats

Building CLI apps for everyone

• mruby-cli

Ruby 2 Methodology

GDB: A gentle intro

• gdb -p 10 - Attach to process and leave you in a prompt
• backtrace - Where am I?
• info threads - List of all the active threads
• thread appli all backtrace - Applies backtrace for all threads
• quit - Exit, duh
• gdb --args ruby snowflake.rb - To run an arbitrary command instead of attach
• run - Run the program started with the previous command
• break rb_ary_uniq_bang - Set a breakpoint on that function
• list - Show source code (like whereami pry)
• display VALUE - Show the value of a variable VALUE
• display (struct RArray)VALUE - Display the value of the memory in Addr VALUE
• For MRI: rb_p - Ruby-like puts in C. Use like call rb_p(VALUE)
• call rb_backtrace() - Ruby-like backtrace
• next (same function), step (drill in), finish (go back one level up)
• continue (go until the end)
• call(rb_p(rb_eval_string_protect("Ruby code", (int*)0)))