An underrated quality of parser combinators is that they're often written in continuation passing style (monadic style is a simple generalisation of this). So, you get "incremental" parsing for free (as "what to do next" is trivially available). So, many of these parsers work well on streams (e.g. TCP sockets) without manually maintaining a state machine - as you may do in C. Further to this, such a state machine is derivable by defunctionalising the parser combinator code. Of course, you get the same benefit if you have decent coroutine support, but it's nice to see techniques that work around not having runtime/language support for such niceties.

There's another, more obscure, technique in the functional programming world called [iteratees](https://okmij.org/ftp/Haskell/Iteratee/index.html) which are quite neat and (as done in related article) linked to "online parser combinators".