Groovy has a safe navigation operator. Yes, this probably enables Law
of Demeter violations, but it is darn useful when you are dealing with
existing Java APIs that required lots.of.dotted.notation.
I would like to have this in Clojure. Anybody else like it?
(defmacro ?.
"like .. but drops out on null object"
([x form]
`(. ~x ~form))
([x form & more]
`(if-let x# (. ~x ~form) (.? x# [EMAIL PROTECTED]))))
BTW, my use case was (?. someClass getProtectionDomain getCodeSource
getLocation). This needs to drop out for null whenever someClass comes
from a ClassLoader that cannot report its location.
Stuart
P.S. A cooler name than "save navigation operator" would be welcome,
and I am not wedded to the Groovy syntax. I initially misremembered it
as ".?" which I think I may like better.
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