The Illuminated Tweets of Elon Musk is a 52-page colouring book in which each illustration is based on a tweet from Elon Musk. My wife and I are colouring one page each week in 2021.

When defining a function with multiple clauses, try to structure the clauses such that the edge-cases are handled first.

We introduce Params modules as a pattern to validate and massage a controller action's params into data that can be passed to contexts.