I noticed I hadn't addressed this question earlier, so. On Apr 9, 3:48 am, James Reeves <jree...@weavejester.com> wrote:
> The problem I have with such a scheme is that it seems more complex to > use in practise. For instance, let's say I wanted an optional value. > If predicates that fail a precondition return a truthy value (such as > :pass) I could write: > > (defn validate-rating [rating] > (validate rating > [:score integer-string? "must be an integer"] > [:score (between 1 10) "must be between 1 and 10"])) > > This would not return an error if the :score field was left blank, > because integer-string? and (between 1 10) would return :pass for an > empty string. > > How would you do this in clj-decline? I wouldn't, directly. There's no way to know that this or is not an error in the input, without the programmers' assistance. clj-decline currently only has "everything must validate" and "no validation must fail" strategies, but it should not be a big deal to add a strategy like "if this predicate (NOT a validation) is true, run these validations, otherwise, accept". I still maintain that this should not be part of basic predicates/ tests. -- 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
