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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> Now, `mapcar' isn't a special form, but even so, I always forget
> whether the predicate is the first or second parameter, due in part
> to `sort' working the opposite way.
> 
> (mapcar FUNCTION LIST)

In Common Lisp it's:

    (mapcar FUNCTION LIST &rest OTHER-LISTS)

If you specify more than one list, FUNCTION will be called with that
many arguments.  In Emacs, the CL version of `mapcar' is called
`mapcar*'.

BW, this fact is a good way of remembering that FUNCTION comes first,
and why.