Types Working For You Richard Dallaway, @d6y underscore.io Modern - PowerPoint PPT Presentation

Aug 25, 2022 •368 likes •1.59k views

Types Working For You Richard Dallaway, @d6y underscore.io Modern type system with lots of power Two Themes Straightforward Scala Types Working for Us Progression Part 1 Straightforward Scala Part 2 Functional Programming Part 3

sealed trait Nat trait Succ[P <: Nat] extends Nat trait Zero extends Nat type One = Succ[Zero] type Two = Succ[One] implicitly[Succ[Zero] =:= One] implicitly[Succ[One] =:= Succ[Succ[Zero]]]
sealed trait Nat trait Succ[P <: Nat] extends Nat trait Zero extends Nat type One = Succ[Zero] type Two = Succ[One] implicitly[Succ[Zero] =:= One] implicitly[Succ[One] =:= Succ[Succ[Zero]]]
sealed trait Nat trait Succ[P <: Nat] extends Nat trait Zero extends Nat type One = Succ[Zero] type Two = Succ[One] implicitly[Succ[Zero] =:= Two] error: Cannot prove that Succ[Zero] =:= Two.

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