Emacs package - try out a new idea by commenting out old code. Easily choose which one to keep later.
Emacs Lisp
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README.md
try-code.el

README.md

Installation:

(autoload 'try-code "try-code"  nil t)
(global-set-key (kbd "C-?") 'try-code)

Commentary:

Scenario: you want to try an alternative implementation of a function while keeping the original within reach.

  1. Select lines.
  2. C-?
  3. (optional) C-y (yank original implementation)
  4. make changes as required
  5. press C-? again

When you reinvoke the function, you can choose which implementation to keep.

Try it out; bug reports are welcome.