Thanks for the clarification Stuart! I think I see how to think about protocols ... and not as an interface, in the java sense. I think it makes sense to me now.
Love your book, btw! -Travis On Jun 21, 12:31 pm, Stuart Halloway <stuart.hallo...@gmail.com> wrote: > Hi Travis, > > The choice of "extend" follows from this reasoning: > > (1) Create a protocol. At this point there are no implementations. Protocol > functions will fail regardless of arguments passed. > > (2) Extend the protocol to a String. The protocol has been *extended* to work > with one type, Strings. > > The word "implements" would imply that something was happening inside > *String*, instead of inside the *protocol*. This is both illegal (in Java), > and undesirable: in languages where it is legal, "monkey patching" tends to > ruin namespaces. > > I agree that the terminology is unfamiliar, but it has to be: the familiar > word "implement" suggests exactly the wrong thing. > > satisfies? should be used very rarely (people will be tempted to use it write > type-tests), so I like the name being distant from extend-protocol, which > will be used often. > > Stu > > > > > I notice that there is a "satisfies?" method to determine if something > > satisfies a protocol. Also, I see that "extend-protocol" doesn't > > actually let one create a protocol which is an extension of another > > protocol. Rather, "extend-protocol" really means "implements", in the > > Java sense. > > > When I first learned about this, I found the naming a little confusing > > and/or misleading. In my humble opinion, based on my experience, I > > would like to propose renaming "extend-protocol" to "satisfy- > > protocol", to make the purpose of the "extend-protocol" method clearer > > and more consistent with the "satisfies?" method. > > > Cheers, > > Travis > > > -- > > 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 -- 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
