1.8 替换你的算法

【1】源代码

 1 // 重构前
 2 QString foundPerson(QStringList people)
 3 {
 4     for (int i = 0; i < people.size(); ++i)
 5     {
 6         if (people[i].compare("Don") == 0)
 7         {
 8             return "Don";
 9         }
10 
11         if (people[i].compare("John") == 0)
12         {
13             return "John";
14         }
15 
16         if (people[i].compare("Dave") == 0)
17         {
18             return "Dave";
19         }
20     }
21 
22     return QString();
23 }

【2】替换算法

 1 // 重构后
 2 QString foundPerson(QStringList people)
 3 {
 4     QStringList candidates = {"Don", "John", "Dave"};
 5     for (int i = 0; i < people.size(); ++i)
 6     {
 7         if (candidates.contains(people[i]))
 8         {
 9             return people[i];
10         }
11     }
12     return QString();
13 }

【3】总结

想要把某个算法替换为另一个更清晰的算法。将函数本体替换为另一个算法。

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