Because nobody has mentioned Erlang yet, I should point out that CouchDB, Riak, and RabbitMQ are all written in it. They seem to be holding their own when it comes to practicality.
Erlang is a functional programming language without so much as a single iteration construct; if you want a loop, you have to use recursion. Variables are immutable, and it communicates via asynchronous messages between lightweight processes.
Erlang is a functional programming language without so much as a single iteration construct; if you want a loop, you have to use recursion. Variables are immutable, and it communicates via asynchronous messages between lightweight processes.