1.8 替换你的算法

【1】源代码

// 重构前
QString foundPerson(QStringList people)
{
    for (int i = 0; i < people.size(); ++i)
    {
        if (people[i].compare("Don") == 0)
        {
            return "Don";
        }

        if (people[i].compare("John") == 0)
        {
            return "John";
        }

        if (people[i].compare("Dave") == 0)
        {
            return "Dave";
        }
    }

    return QString();
}

【2】替换算法

// 重构后
QString foundPerson(QStringList people)
{
    QStringList candidates = {"Don", "John", "Dave"};
    for (int i = 0; i < people.size(); ++i)
    {
        if (candidates.contains(people[i]))
        {
            return people[i];
        }
    }
    return QString();
}

【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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