Function global-set-key is an interactive function based on define-key which you can invoke by typing M-x global-set-key. Function define-key is rather used in Lisp programs. You can look up global-set-key‘s source code with C-h f global-set-key to see that it only wraps define-key. To answer your question, there are no significant differences between them.
Since in elisp, a String is an int array, you can use (= (length user-str) 0) You can also use (string=) which is usually easier to read (string= “” user-str) Equal works as well, but a bit slower: (equal “” user-str)
Sometimes default-directory for the current buffer may be set to something other than the current directory of the file the buffer is currently visiting, in which case the solution above wouldn’t give what the asker was looking for. In such cases, you can use the file-name-directory method, like so: (file-name-directory buffer-file-name) Here is a link … Read more
You’re looking for kill-new. kill-new is a compiled Lisp function in `simple.el’. (kill-new string &optional replace yank-handler) Make string the latest kill in the kill ring. Set `kill-ring-yank-pointer’ to point to it. If `interprogram-cut-function’ is non-nil, apply it to string. Optional second argument replace non-nil means that string will replace the front of the kill … Read more
Unlike Scheme, Emacs Lisp is a 2-lisp, which means that each symbol has two separate bindings: the value binding and the function binding. In a function call (a b c d), the first symbol (a) is looked up using a function binding, the rest (b c d) are looked up using the value binding. Special … Read more
I am not sure of what you are trying to achieve, but format converts “stuff” to strings. For instance: (format “%s” your-list) will return a representation of your list. message uses format internally, so (message “%s” your-list) will print it
Try M-x clone-indirect-buffer or C-x 4 c. For details, see Indirect Buffers.
From etc/NEWS: * Lisp Changes in Emacs 24.4 … ** New macro `with-eval-after-load’. This is like the old `eval-after-load’, but better behaved. Emacs 24.4 was released on 20th October 2014. eval-after-load is considered ill-behaved because it is a function, not a macro, and thus requires the code inside it to be quoted, which means that … Read more
It’s easy to evaluate Lisp expressions in Inferior Emacs-Lisp Mode: M-x ielm You can read more about this feature in the Emacs manual section on “Lisp Interaction”
These functions are in the CL package, you will need to (require ‘cl) to use them: (remove-if-not #’evenp ‘(1 2 3 4 5)) This will return a new list with all even numbers from the argument. Also look up delete-if-not, which does the same, but modifies its argument list.