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如
zerop // 判断参数是否为0的函数
listp // 判断参数是否是列表的函数
p 是 predicate 的缩写
predicate
[‘pred?k?t]
vi. 断言
In the jargon used by the early Lisp researchers, a predicate refers to a function to determine whether
some property is true or false.
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原文地址:http://www.cnblogs.com/aqing1987/p/4203813.html