Algorithms

There are conceptually (for me, anyway) two different kinds of programming problem. First is the "set it up and let it run" kind that Declarative mostly addresses - the construction of data structures to model and simulate a particular system.

The second is solution algorithms - code that takes a particular question or problem in a problem space and derives a solution. This stuff often verges on artificial intelligence, and Declarative mostly doesn't address it. Nor should it, arguably - Declarative is intended to declare things and remove the hassle of setting all that framework stuff up. You can implement your algorithms in whatever language you like within that framework.

Anyway, this came up because of an interesting post on dynamic programming.