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(define (make-accumulator index) | ||
(lambda (number) | ||
(begin (set! index (+ number index)) index) | ||
) | ||
) | ||
(define A (make-accumulator 5)) |
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(define (m b) | ||
(lambda (a) | ||
(if (>= b a) (begin (set! b (- b a)) b) "err") | ||
) | ||
) | ||
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(define a2 (m 100)) | ||
(define (make-withdraw balance) | ||
(lambda (amount) | ||
(if (>= balance amount) | ||
(begin (set! balance (- balance amount)) balance) | ||
"error" | ||
) | ||
) | ||
) | ||
(define a1 (make-withdraw 100)) | ||
(define (make-bank-account balance) | ||
(lambda (n) | ||
(set! balance (+ balance n)) | ||
balance)) | ||
(define gates-bank-account (make-bank-account 10)) |
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# 赋值和局部状态 | ||
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介绍了两种策略,一种是对象策略,针对物理系统里面的对象,创建一个计算对象。流式策略,就是将数据在程序里面传递,有个坏处,如果程序是并发执行的会导致一些问题,解决这个一般采用延时策略。 | ||
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## 局部状态变量 | ||
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这个就不说了,以一个状态值记录一些信息在java里面是很常见的事情。 |