RacketCon Tutorial on Typed Racket Typed Racket Basics Your first Typed Racket program #lang typed/racket (module+ main (displayln "Hello World")) Intro Next Union Polymorphism Advanced Porting small programs Take the programs on the Racket website (collected in the website directory) and port them to Typed Racket. A Bigger Step Working through the More: Systems programming in Racket tutorial