Hacker News new | comments | show | ask | jobs | submit login

I think you're underestimating how much work the type system is doing here: `option` isn't a function. It's part of the return type definition. The whole point of having a type system as strict as ML's or Haskell's is to avoid the sort of problem you had in VB6. Automatic typecasting is a very, very different beast to type inference: in Haskell, your problematic code likely wouldn't have got past the compiler. You're precisely wrong when you say that it's easy to break the hd function by changing the implementation to return a different type. If you do that, your program won't build.



Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | DMCA | Apply to YC | Contact

Search: