Wow. I wasn't trying to be a trouble maker. :) I was just looking to clarify my understanding and didn't understand the conflict between the definition and example. Unless "?" was idiomatic for things other than predicates.
Thanks for the clarification. I have yet to encounter the situation of being condemned to an extra glass of wine being punishment. Hmm. Jimmie Stuart Halloway wrote: > The question mark suffix should be used only for predicates. The > author of the erroneous prose is currently being forced to drink an > extra glass of wine before bed as punishment. > > I have *no* idea why I wrote that -- best guess is that is-small? > started as a predicate and was later changed for demo reasons. > > Stuart > > >> Meikel Brandmeyer wrote: >> >>> Hi, >>> >>> Am 21.07.2009 um 22:48 schrieb Jimmie Houchin: >>> >>> >>>> (defn is-small? [number] >>>> (if (< number 100) "yes" "no" )) >>>> >>>> Is is-small? a predicate? If so, is this a common pattern for >>>> such >>>> predicates? >>>> >>> The definition is correct. is-small? is not >>> a predicate. It returns a string. So (if (is-small? x) ..) >>> is always true! I suspect that the string >>> produced by is-small? is used somewhere. >>> >>> (defn is-small? >>> [number] >>> (< number 100)) >>> >>> This would be a predicate since it returns >>> a Boolean. >>> >>> Hope this helps. >>> >>> Sincerely >>> Meikel >>> >> Thanks for the information. >> >> That is what I thought. Is it proper or idiomatic Clojure to use a "?" >> symbol on non-predicate functions? >> >> That is somewhat what prompted my question. If a "?" symbol is >> generally, always or primarily reserved for predicates, it just seemed >> strange to use a non-predicate example in the book. Especially when >> the >> example could just as easily used true or false, instead of yes >> or no. >> >> Thanks again. >> >> Jimmie --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
