fboundp and functionp: what's the difference?

i'm kinda confused on what makes `fboundp` and `functionp` functionally different from each other. it seems to me that i can just swap between the two whenever.

`FUNCTIONP` tells you if *its argument is* a function value; `FBOUNDP` tells you if *a symbol has* a function value bound to it. ELISP> (functionp 'car) t ELISP> (fboundp 'car) t ELISP> (functionp (lambda ())) t ELISP> (fboundp (lambda ())) *** Eval error *** Wrong type argument: symbolp, (closure (t) nil)

I'll add a bit. And `(fboundp 'sym)` is ~~functionally equivalent~~ to `(functionp (symbol-function 'sym))`, so you could say `functionp` is a ~~more generic function~~. EDIT: See [u/xtifr](https://www.reddit.com/r/emacs/comments/wft3je/comment/iiwci66) comment.

Also, fboundp tells you whether the symbol's function cell contains *something*, not whether that something is a valid function. ELISP> (fset 'foo "abc") "abc" ELISP> (fboundp 'foo) t ELISP> (functionp 'foo) nil (The docs assure me that there are reasons for putting a keymap or keyboard macro in a symbol's function cell, but I'm fuzzy on the details.)

thanks everyone, appreciate the examples!

Good point.

> (The docs assure me that there are reasons for putting a keymap or keyboard macro in a symbol's function cell, but I'm fuzzy on the details.) You can`fset` keyboard macros with `kmacro-lambda-form` and a vector of the actions-to-be. That's what `insert-kbd-macro` code generates for you.