rubyday - "Checking Your Types: An Overview of Ruby's Type System" - a talk by Sabrina Gannon, Senior Software Developer @ Dribbble Participate and interact live with speakers and attendees: join us
Solved Which of the following is supported by Ruby? A. | Chegg.com
Type Checking Ruby Programs with Annotations - Speaker Deck
Sorbet - Making Ruby Statically Typed
A few words on Ruby's type annotations state
Rocky Mountain Ruby 2017 - Trust, But Verify (Programmatically) by Ben Orenstein