程序员应该避免的5种代码注释

你有没有这样的经历:别人审查过你的代码之后给出的注释,你认为是没有必要的?注释代码是为了提高代码的可读性,目的是为了能让其他人更容易理解你的代码。

我特别讨厌这 5 种注释类型以及制造它们的程序员。希望你不是其中之一。

1. 自以为很了不得的程序员

public class Program
{
    static void Main (string[] args)
    {
        string message = "Hello World!";  // 07/24/2010 Bob
        Console.WriteLine (message); // 07/24/2010 Bob
        message = "I am so proud of this code!"; // 07/24/2010 Bob
        Console.WriteLine (message); // 07/24/2010 Bob
    }
}

这个程序员自认为写了一段很了不得的代码,所以觉得有必要用自己的名字对每行代码进行标记。实施版本控制系统(VCS)能实现对代码变更的问责,但是也不会这么明显知道谁应对此负责。

2. 过时的程序员

public class Program
{
    static void Main (string[] args)
    {
        /* This block of code is no longer needed
         * because we found out that Y2K was a hoax
         * and our systems did not roll over to 1/1/1900 */
        //DateTime today = DateTime.Today;
        //if (today == new DateTime (1900, 1, 1))
        //{
        //    today = today.AddYears (100);
        //    string message = "The date has been fixed for Y2K.";
        //    Console.WriteLine (message);
        //}
    }
}

如果一段代码已不再使用(即过时),那就删除它——不要浪费时间给这些代码写注释。此外,如果你需要复制这段被删除的代码,别忘了还有版本控制系统,你完全可以从早期的版本中恢复代码。

3. 多此一举的程序员

public class Program
{
    static void Main (string[] args)
    {
        /* This is a for loop that prints the 
         * words "I Rule!" to the console screen 
         * 1 million times, each on its own line. It
         * accomplishes this by starting at 0 and 
         * incrementing by 1. If the value of the 
         * counter equals 1 million the for loop
         * stops executing.*/
        for (int i = 0; i < 1000000; i++)
        {
            Console.WriteLine ("I Rule!");
        }
    }
}

我们都知道基础的编程逻辑是如何工作的——所以你不需要多此一举来解释这些显而易见的工作原理,虽然说你解释得很 happy,但这只是在浪费时间和空间。

4. 爱讲故事的程序员

public class Program
{
    static void Main (string[] args)
    {
       /* I discussed with Jim from Sales over coffee 
        * at the Starbucks on main street one day and he
        * told me that Sales Reps receive commission 
        * based upon the following structure. 
        * Friday: 25%
        * Wednesday: 15%
        * All Other Days: 5%
        * Did I mention that I ordered the Caramel Latte with
        * a double shot of Espresso? 
       */
        double price = 5.00;
        double commissionRate;
        double commission;
        if (DateTime.Today.DayOfWeek == DayOfWeek.Friday)
        {
            commissionRate = .25;
        }
        else if (DateTime.Today.DayOfWeek == DayOfWeek.Wednesday)
        {
            commissionRate = .15;
        }
        else
        {
            commissionRate = .05;
        }
        commission = price * commissionRate;
    }
}

如果你一定要在注释里提及需求,那么不要涉及别人的名字。销售部门的 Jim 可能会离开公司,而且很有可能大多数程序员根本不知道这是何许人也。不要在注释里提及不相干的事实。

5. “以后再做”的程序员

public class Program
{
    static void Main (string[] args)
    {
       //TODO: I need to fix this someday - 07/24/1995 Bob
       /* I know this error message is hard coded and
        * I am relying on a Contains function, but 
        * someday I will make this code print a 
        * meaningful error message and exit gracefully.
        * I just don't have the time right now.
       */
       string message = "An error has occurred";
       if(message.Contains ("error"))
       {
           throw new Exception (message);
       }
    }
}

这种类型的注释包含了上面所有其他类型。如果是在项目的初始开发阶段,这种待做注释是非常有用的,但如果是在几年后的产品代码——那就会出问题了。如果有什么需要修复的,立马解决,不要把它搁置一边,“以后再做”。

如果你也常常犯这样的注释错误,如果你想了解注释的最佳做法,我建议你阅读类似于 Steve McConnell 写的《Code Complete》这样的好书。

本文文字及图片出自 www.codeceo.com

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