RPC is a domain where functional patterns really shine since the high-latency nature of network traffic is well suited to asynchronous, callback-oriented event

RPC is a domain where functional patterns really shine since the high-latency nature of network traffic is well suited to asynchronous, callback-oriented event systems which are themselves inherently functional. My own RPC system enforces continuation passing style exclusively to unify the calling and return-value semantics. With this functional pattern in place it was pretty straight forward to transparently wrap arbitrarily many closures arbitrarily deeply in callback argument lists and method requests (which are the same thing under continuation passing style).