Evan Martin (evan) wrote in evan_tech,
Evan Martin


This bug makes me a little sad. From one of the patches for fixing:
- @string = (str.string rescue str)
+ @string = str.respond_to?(:string) ? str.string : str

The problem is that the former method uses an exception handler, and when an exception is generated it includes a backtrace, and this particular bit of code gets called with very deep call stacks, so that bit of code ends up being expensive.

I think the fixed code better expresses what the code was trying to do -- the former one could imaginably produce strange errors if you had, for example, a typo in an object's "string" method -- but the underlying problem is the sort of leaky abstraction that endemic to programming in general and always disappoints me a bit with the state of our art.
Tags: ruby

  • blog moved

    As described elsewhere, I've quit LiveJournal. If you're interested in my continuing posts, you should look at one of these (each contains feed…

  • dremel

    They published a paper on Dremel, my favorite previously-unpublished tool from the Google toolchest. Greg Linden discusses it: "[...] it is capable…

  • treemaps

    I finally wrote up my recent adventures in treemapping, complete with nifty clickable visualizations.

  • Post a new comment


    default userpic
    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.