7 The Listener
valto some other number, and want to know the sum of three
vals again, you can avoid re-typing the form which computes it. To see how this is done, follow the instructions below.
(setq val 1).
valis now set to 1.
PROMPT > (setq val 1)
Meta-Pagain, and then press Return.
PROMPT > (+ val val val) 3 PROMPT >Pressing
Meta-Pa second time displayed the second to last form that you evaluated. This time, pressing Return immediately afterwards simply re-evaluates the form. Note that you could have edited the recalled form before evaluating it. You can use
Meta-Prepeatedly, recalling any form that you have evaluated in the current session.
This time the form evaluates to the number
val changed in the interim.
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