openlang
Tools and maintenance

Exchange a pair of Elisp bindings

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Say I've got

(setq left 3
      right 4)

What's a neat way to exchange what left and right hold, avoiding an extra temporary binding?

The conversation continues 3

Follow the reasoning

  1. As far as I remember, if using cl-lib is acceptable, try:

    (cl-rotatef
 left right)

    Note that the approach here comes from Common Lisp.

  3. For integer values:

    (setq left (logxor left right))
(setq right (logxor left right))
(setq left (logxor left right))

    :)

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