;; let.txt

;; --- let ---

(let ((a 1) 
      (b 2))
  (+ a b))
=> 3

;; empty let
(let () 3)
=> 3

;; let that refers to outside scope
(define a 10)
(let ((a 3)
      (b (+ a 1))) ;; 11
  (+ a b))
=> 14

;; --- let* ---

(define a 10)
(let* ((a 1)
       (b (+ a 1))) ;; 2
  (+ a b))
=> 3

;; --- let# ---

(define numbers '(1 2 3))
(let# (a b c) numbers
  (list (+ a b) (+ b c) (+ a c)))
=> (3 5 4)