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Comment by pandatigox | Hacker News Reader

I'm digressing a bit, but what language is used here? A skim-over looks like Prolog, but recommendation links at the bottom say Scala. Are the functions (when, and) predefined and not part of the language itself?

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It's Scala. They show the definitions of the "When" and "And" in the post:

  case class And(contract1: Contract, contract2: Contract) extends Contract
  case class When(date: LocalDate, contract: Contract) extends Contract

It's basically a DSL on top of Scala.

Not a digression, one of the reasons for this post was to practice Scala a bit further.

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