Hello,guys!
I'm reading 《Programming Clojure》. I've seen closure. But I
haven't seen how simulate Class.
Lisp can simulate Class by closure and nest Function.
Example:
(define (make-account balance)
(define (withdraw amount)
(if (>= balance amount)
(begin (set! balance (- balance amount))
balance)
"Insufficient funds"))
(define (deposit amount)
(set! balance (+ balance amount))
balance)
(define (dispatch m)
(cond ((eq? m 'withdraw) withdraw)
((eq? m 'deposit) deposit)
(else (error "Unknown request -- MAKE-ACCOUNT"
m))))
dispatch)
(define acc (make-account 50))
((acc 'deposit) 40)
90
((acc 'withdraw) 60)
30
But how Clojure do it?
by Edward Shen from Shanhai,China
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