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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.
apply , function, 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.