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2021/11/2 paradigm 笔记
1 嵌套列表结构的遍历
if … else … 的注意事项：
1.1 cond
cond是if…else… 的扩展，能够级联实现if… else if… else…
1.2 递归实现flatten函数
(define (flatten sequence)(cond ((null? sequence) '())((list? (car sequence))(append (flatten (car sequence))(flatten (cdr sequence))))(else (cons (car sequence)(flatten (cdr sequence))))))
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2021/11/2 paradigm 笔记
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