Just a note that the "loop over lines of stdin and do some basic calculations" use case highlights probably one of the places where it's really easy to blow up Nim's performance benefits -- string or seq copies. :/
The issue is that Nim's string library ends up making copies when doing things. It's a sane default and ensures sane behavior. However, it often leads beginner's to make slower programs, sometimes even slower than equivalent Python ones. If you used `strcopy` in C a lot, you'd get similar results.
Often the solution is trivial and is just to use the `var` or `openArray[T]` variants of proc's. It's one of the points in the blog post and is crucial for good real time code. I'm hopeful the new `lent` and `view` features will make it easier to use non-copy slices on strings. That'd be nice!
The issue is that Nim's string library ends up making copies when doing things. It's a sane default and ensures sane behavior. However, it often leads beginner's to make slower programs, sometimes even slower than equivalent Python ones. If you used `strcopy` in C a lot, you'd get similar results.
Often the solution is trivial and is just to use the `var` or `openArray[T]` variants of proc's. It's one of the points in the blog post and is crucial for good real time code. I'm hopeful the new `lent` and `view` features will make it easier to use non-copy slices on strings. That'd be nice!