Quote, Quasiquote and Symbolic Data

(quote a)                    ; a
'a                           ; a
'(1 2 (3 4))                 ; (1 2 (3 4))
(car '(quote x))             ; quote: 'x is literally (quote x)

(define n 5)
`(n is ,n)                   ; (n is 5)
`(sum ,(+ 1 2) list ,@(list 4 5))   ; (sum 3 list 4 5)
`#(1 ,(+ 1 1))               ; #(1 2): quasiquote works in vectors
`(1 `(2 ,(3 ,(+ 1 3))))      ; nested quasiquote: (1 `(2 ,(3 4)))

;; Building code with quasiquote
(define (make-adder-expr n) `(lambda (x) (+ x ,n)))
(make-adder-expr 10)         ; (lambda (x) (+ x 10))