Created
December 3, 2016 02:37
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common lisp 的访问器 ELT
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| 语法 | |
| elt sequence index => object | |
| (setf (elt sequence index) new-object) | |
| 参数和值 | |
| sequence --- 一个属性序列 | |
| index --- 属性序列的 index | |
| object --- 一个 object | |
| new-object --- 一个 object | |
| 描述 | |
| 用 index 访问序列的元素 | |
| 代码 | |
| * (eql str (copy-seq str)) | |
| NIL | |
| * (setq str (copy-seq "0123456789")) | |
| "0123456789" | |
| * (elt str 6) | |
| #\6 | |
| * (setf (elt str 0) #\#) | |
| #\# | |
| * str | |
| "#123456789" |
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