Make the jump from Ruby to Clojure and functional programming, one idiom at a time. Quizzes after every chapter and a final exam earn a certificate.
Learn TypeScript by comparing it with the Ruby you already know. Chapter quizzes and a final exam lead to a certificate.
Learn Rust by mapping it to the Ruby you already write. Each chapter ends with a quiz, and a final exam earns you a certificate.
Learn Go through the lens of Ruby, comparing each idiom side by side. Quizzes after every chapter and a final exam earn you a certificate.