On Sun, Sep 13, 2015 at 2:13 AM, Taylan Ulrich Bayırlı/Kammer <xxxxxx@gmail.com> wrote:

- hashtable-fold -> hashtable-sum

Once again, argument order for one, and more importantly different
semantics. "Sum" is a good name because it makes it obvious that the
given procedure should be associative and commutative in a sense.

Another option can be hashtable-reduce.

"Reduce" has precedence in CL and some other languages but the usage seems a bit more liberal

than "fold" - some allows omitting initial value, for example.

Well, srfi-1 has reduce, unfortunately. But the combined name xxx-reduce hasn't been used as much

as xxx-fold in Schemes.

What's bothers me on sum is that it's not only suggest associativity and commutativity, but also

implies the elements (to be fold) and the accumulated value are of the same type. In hashtables,

the elements are actually a key and a value, so confusion is less likely, but if we want to extend

xxx-sum for a general name of the "Container-first" pattern, the implication may get in the way.