SETQ

SETQ is a special form that evaluates its second argument and assigns that value to the symbol which must be its first argument.

> (setq x (+ 1 2 3))

6

> (setq x (* x 3))

18

> (setq y ’(+ 1 2 3))

(+ 1 2 3)

> (setq y (rest y))

(1 2 3)

> (setq y (first y))

1

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