I don't know that I feel the same way in this case. I always felt like collections of strings read very badly without commas.

I have felt that way sometimes, although I often think blanks sometimes provide a better visual delimiter. In this specific case, since the strings themselves contain commas (2nd example), it is not obvious which commas are delimiters and which are part of the data.

Even in java code, I would almost always write something like "foo( firstParam, secondParam, thirdParam )" instead of "foo(firstParam,secondParam,thirdParam)", since the spaces seem (to me) to make the symbols jump out visually, while the commas tend to blend-in a bit. Migrating to clojure, the commas are now redundant with the spaces so I would write "(foo firstParam secondParam thirdParam)".

For really complex parameters, I will often just put each param on a separate line to make it obvious where one ends and the next begins:

(foo  my-first-big-long-param
      #(reduce some-fun {} (bar a b c))
      [and-yet-another complicated-param eter] )

Alan

Becuase they are lines in this case, I've changed the commas to newlines. Thanks for bringing this up.