If the functions are all clearly named and reasonably small-ish DSLs can be mostly self-documenting. Plus you can always ctrl click in your IDE of choice to vi

If the functions are all clearly named and reasonably small-ish DSLs can be mostly self-documenting. Plus you can always ctrl click in your IDE of choice to view function source. I'm talking something like this: f(base data) .validate() .domainAction1() .domainAction2() .log() .describe() .sendHtmlResponse()