clojure.spec/double-in defines a spec that tests whether a double is greater than or equal to a minimum value and less than or equal to a maximum value. This is useful for many purposes, but sometimes you need to test whether a double is greater than a minimum or less than a maximum. There are many mathematical applications that assume half-open intervals (> min and <= max; >= min and < max) or open intervals (> min and < max). Example: You are going to divide by the double, so it must be > 0, not just >= 0. Providing double-in but only allowing it to specify closed intervals seems arbitrary.
It's easy enough to write open-interval and half-open interval tests, either using s/and with s/double-in, or just by defining a function from scratch. However, if Clojure is going to provide double-in, why make us do that? Why not have a common interface that adds two optional keywords to specify whether the bounds are open or closed? This is not a request to add the kitchen sink; it's a natural extension to deal with a common use case. The alternative would be to define three additional versions of double-in, and people will do that on their own, or define a new more flexible double-in if there's no built-in spec function that does it. I'd suggest a new keyword with one of the following forms: :min-open, :min-greater, :min-greater-than, :min-strict, :greater-min, :strict-min, etc., and a corresponding keyword for the max side. Default values should be false, for compatibility with the current definition of double-in. I can add a JIRA ticket if this seems worthwhile. I wanted to see what people think first. (I'd have to sign up with the JIRA system, but I assume I'm allowed to do that.) -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at https://groups.google.com/group/clojurescript.
