[ALGOG-2] dispatch for fmap multimethod shouldn't be on type of second argument

Wed, 22 May 2013 18:34:29 -0500

AFAICT having fmap dispatch on the type of the second argument makes it practically impossible to define fmap for arbitrary functions, since the type is different for each function:

user> (type type)
clojure.core$type
user> (type fn?)
clojure.core$fn_QMARK_
user> (type not=)
clojure.core$not_EQ_
user>

However, there's a perfectly reasonable definition of fmap for functions (fmap = comp).

To my mind the simplest/best thing to do is just have a Functor protocol and have fmap call a function in it, with the order of arguments reversed so that dispatch will happen correctly.

[ALGOG-1] Mention algo.generic.functor in README

Fri, 23 Nov 2012 15:22:42 -0600

All algo.generic submodules except for functor are mentioned in the README.

Attached is a patch that rectifies this.

Clojure JIRA

[ALGOG-2] dispatch for fmap multimethod shouldn't be on type of second argument

[ALGOG-1] Mention algo.generic.functor in README