How can I create a RESTful calculator?

Question

Given that RESTful web services are all based around the sacred idea that \"everything is represented as resources and can be accessed by an address (URI)\", this may make sense

Answer 1

This is a good example of the tension between nouns and verbs in REST. The suggestion to use "add" or "adder" as the resource is tremendously naïve. It implies that each operation be performed separately as a GET to an "adder" or "subtractor". Of course, one can have the resource be "calculate" but then we're using a verb. We can change it to "calculator" or "answer", which are nouns but we really haven't done anything useful.