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    July 18

    sicp 2.74

    因为各个部门编制的员工文件有不同的数据结构,对数据的具体操作需要与其所在的部门文件相适应,可以使用(list 'division file)的方式给不同部门的文件打上标签,再使用data-directed方法构造通用函数,即使其后有新部门加入只需在type-operation表中添加相应procedure就可以了.

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    小西wrote:
    路过~~~
    Aug. 18

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