I'm trying to apply a logic function over a list, but:
e.g.(apply 'and some_list) give me Invalid function: and.
There is a way to apply a logical function to a list?
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This is because and is not a function (it is a special form).
Note that C-h f and tells you "and is a special form in `C source code'."
apply must be used with a function.
The manual says:
‘apply’ returns the result of calling FUNCTION. As with ‘funcall’, FUNCTION must either be a Lisp function or a primitive function; special forms and macros do not make sense in ‘apply’.
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1It's not possible to write
andas a function -- functions evaluate all of their arguments, whereas macros and special forms receive their arguments un-evaluated (which is necessary forand, which must not evaluate the remaining arguments if it has already failed). – phils Oct 15 '18 at 21:52 -
there is a non lazy set of logic functions? or, what is the best way to do this? – Francesco Cadei Oct 15 '18 at 21:55
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3@FrancescoCadei For
andyou have(cl-every #'identity some_list)and fororyou have(cl-some #'identity some_list). – Tobias Oct 15 '18 at 21:59 -
3If all you want is a nil or non-nil result, then
(memq nil LIST)will tell you if any of the list elements isnil. – phils Oct 15 '18 at 21:59
C-h f apply..... – Drew Oct 15 '18 at 22:48