Consider yourself fortunate to have (forgive the assumption!) never worked in a ruby codebase that uses eventmachine or promise.rb. It’s less common than in so

Consider yourself fortunate to have (forgive the assumption!) never worked in a ruby codebase that uses eventmachine or promise.rb. It’s less common than in some other languages but ruby is perfectly capable of a callback/promise-based model for performing async io or query batching, for example. And it creates exactly the “function color” problem that this article describes.