Change scratch buffer to org mode by default

Question

When I test some codes in scratch buffer, usually first set it as org mode manually.

How could config it as 'org mode' rather than fundamental mode by default.

Answer 1

Here is a link to another thread you may be interested in, entitled "Is it possible to create an org-mode scratch buffer?":

Is it possible to create an org-mode *scratch* buffer?

New buffers that are not the *scratch* buffer, should default to fundamental-mode; e.g., when calling get-buffer-create. As to the *scratch* buffer, you can customize the initial-major-mode variable:

initial-major-mode is a variable defined in ‘startup.el’.
Its value is ‘lisp-interaction-mode’

Documentation:
Major mode command symbol to use for the initial ‘*scratch*’ buffer.

You can customize this variable.

Thus, use the following:

(setq initial-major-mode 'org-mode)

Answer 2

Just to be sure you know: M-x ielm will open IELM: a proper read-eval-print loop (REPL) for Elisp. Take a look at its documentation string (C-h f ielm RET) to get an idea of how powerful and flexible it is.

I find IELM much more useful and usable than either lisp-interaction-mode -- the default mode for *scratch*, as noted by @lawlist -- or Org mode. Coding is about the only thing Org is not good for. :-)

REPL article at Wikipedia