Created
December 4, 2016 06:23
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common lisp 的函数 NULL
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| 语法 | |
| null object => boolean | |
| 参数和值 | |
| object --- 一个 object | |
| boolean --- 一个 boolean | |
| 描述 | |
| 如果 object 是一个空 list, 返回 T, 否则返回 nil | |
| 代码 | |
| * (null '()) | |
| T | |
| * (null t) | |
| NIL | |
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