Run ⌘↵ Format Load an example Examples Hello, world Pattern matching Reified generics Aliases and newtypes Closures and function types Classes and interfaces Backed enums Shapes and range types Expression control flow Catch guards and cleanup Using and resource lifetime Collections Runtime reflection Async tasks Channels JSON UUIDs Dates and calendars Regular expressions Unicode URLs and queries CSV streams BSON documents Compression streams Hashes and HMAC HTML text Binary integers IP and CIDR Option and Result Random sequences Shell escaping ANSI · terminal colors Args · command lines Cache · local storage Clock · controlled time Config · typed settings Diff · edit sequences Dotenv · environment files Event · dispatching Expect · test assertions Fake · test data Fn · function composition Humanize · readable values Log · structured events Markdown · terminal output Money · exact amounts OTP · one-time passwords QR · code matrices Seal · signed tokens SemVer · version ranges Template · Mustache