funcall function {&rest args} => {result}{*}
function---a function designator.
args---arguments to the function.
results---the values returned by the function.
funcall applies function to args.
If function is a symbol, it is coerced to a function as if by finding its functional value in the global environment.
(funcall #'+ 1 2 3) => 6
(funcall 'car '(1 2 3)) => 1
(funcall 'position 1 '(1 2 3 2 1) :start 1) => 4
(cons 1 2) => (1 . 2)
(flet ((cons (x y) `(kons ,x ,y)))
(let ((cons (symbol-function '+)))
(funcall #'cons
(funcall 'cons 1 2)
(funcall cons 1 2))))
=> (KONS (1 . 2) 3)
An error of type undefined-function should be signaled if function is a symbol that does not have a global definition as a function or that has a global definition as a macro or a special operator.
section apply [Function] , function, section Evaluation
(funcall function arg1 arg2 ...) == (apply function arg1 arg2 ... nil) == (apply function (list arg1 arg2 ...))
The difference between funcall and an ordinary function call is that in the former case the function is obtained by ordinary evaluation of a form, and in the latter case it is obtained by the special interpretation of the function position that normally occurs.
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