LET* vs LET

LET (“Parallel”) begins the scope of each local binding at the first form after all the local bindings have been established.

LET* (“Sequential”) begins the scope of each local binding immediately after its initial assignment.

> (let ((x 5) (y 10) (z 30) w)

(set! w (+ x y z) )

(print w) )

45

45

> (let* ((x 5) (y (* x 2)) (z (* y 3)) w)

(set! w (+ x y z))

(print w) )

45

45

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