Day 63

Today, I:

• learned about Ruby's and vs && — same boolean idea, but different precedence (&& binds tighter than and, so mixing them in assignments/conditionals can surprise you)
• learned about multithreading in Rails for IO-bound work (HTTP requests, file reads) from this Medium post — can speed those up in-process instead of always shipping them to async jobs
• reminded myself that in Ruby ternary / conditionals, [] and "" are truthy — everything is an object, and only nil and false are falsy
• (re)learned how threads, workers, processes, and the DB connection pool relate — wrote it down simply in Rails Threads, Workers, Processes, and the DB Connection Pool (ELI5)