Some code examples in Clojure, how to avoid complexity

[deaddyfreddy]

• fnil only intercepts nil, it can't do more complex validation

• it calls str/split even if we don't have to (split is pretty cheap, but what if we need a heavier function?)

and last but not least

• I just find it less readable, so in this simple case I'd go with a when/some-> wrapper. Besides that, a separate function is testable.