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代码看着就费劲,到底哪里出了问题?

  • 2026-02-04 07:46:10
代码看着就费劲,到底哪里出了问题?

在初级程序员和高级程序员之间,有一条明显的分界线,就是代码质量。初级程序员写的代码,很多时候混乱不堪,看着就头疼;而高级程序员写的代码,看着就比较简洁,让人读着也不太费力。这中间的差别到底是什么呢?

表意清晰

代码首先是写给人看的。如果我们只凭潜意识或直觉写代码的话,代码也许能正确运行,但通常会不好理解。我们需要有意识地去标记那些具体的、有意义的概念。这里不仅包括变量的命名,也包括逻辑本身。有如下代码:

funcSetVip(userId uint32, days int) (stringerror) {    return cache.Redis.Set("vip:"+strconv.FormatInt(int64(userId), 10), time.Now().Unix() + 86400*int64(days), 0)}
以上代码是一个设置VIP的函数。看着貌似简洁的一行代码,读起来实际却稍显费力。我们尝试去做一些优化:
funcSetVip(userId uint32, days int) (stringerror) {    now := time.Now().Unix()    expiredTime := now + 86400*int64(days)    cacheKey := "vip:" + strconv.FormatInt(int64(userId), 10)    return cache.Redis.Set(cacheKey, expiredTime, 0)}
这里,我们引入了几个具体的概念:当前时间(now)、缓存键名(cacheKey)和过期时间(expiredTime)。很明显,这些具体概念的加入,让我们能更轻松地理解代码逻辑。人类天生不喜欢抽象、复杂的东西。越具体的概念,越容易被人接受,也越容易被人理解。

逻辑结构化

当然,光是表意清晰肯定是不够的。有些项目,具体细节看着都不费力,但整体一看,却又混乱的让人不知所云。这大概率是因为,代码在整体上没有条理清晰的逻辑结构。提纲挈领,有着清晰的目录,几百万字的书籍也能很快了解个大概;全部平铺直叙,800字的短文也会让人匪夷所思。有如下代码:

funcSetVip(userId uint32, days uint32) error {    // 获取现有用户的vip信息    cacheKey := "vip:" + strconv.FormatInt(int64(userId), 10)    value, err := cache.Redis.Get(cacheKey)    if err != nil {        return err    }    // 当前时间    now := time.Now().Unix()    // 用户无vip的处理逻辑    vipTime, _ := strconv.ParseInt(value, 1064)    if vipTime == 0 {        expiredTime := now + 86400*int64(days)        return cache.Redis.Set(cacheKey, expiredTime, 0)    } else {        // 用户有vip还未过期的处理逻辑        if vipTime >= now {            expiredTime := vipTime + 86400*int64(days)            return cache.Redis.Set(cacheKey, expiredTime, 0)        } else {            // 用户有VIP但已经过期的处理逻辑            expiredTime := now + 86400*int64(days)            return cache.Redis.Set(cacheKey, expiredTime, 0)        }    }}

以上代码增加了VIP提前续费的兼容。仔细阅读,倒也能明白大致含义。但读起来还是有些费力。这里,我们稍微做一些优化:

funcSetVip(userId uint32, days uint32) error {    // 获取现有用户的vip信息    cacheKey := "vip:" + strconv.FormatInt(int64(userId), 10)    value, err := cache.Redis.Get(cacheKey)    if err != nil {        return err    }    // 计算过期时间    vipTime, _ := strconv.ParseInt(value, 1064)    expiredTime := ExpiredTime(vipTime, days)    // 设置新的过期时间    return cache.Redis.Set(cacheKey, expiredTime, 0)}funcExpiredTime(vipTime int64, days uint32) int64 {    // 当前时间    now := time.Now().Unix()    // 未设置或已过期则从当前时间计算    if vipTime < now {        return now + 86400*int64(days)    }    // 还未过期则从过期时间计算    return vipTime + 86400*int64(days)}

新代码重新梳理了原有逻辑,让其有了更加精细的层次化结构。很明显,可读性有了很大的提升。这里,也利用了函数的提前返回机制,让代码变得更加简洁。所以,实际编程中,我们需要挖掘更细节的逻辑结构,让程序更加清爽起来。

骨灰级原则

这里,还有一条骨灰级的编码准则,信仰一般遵守,才会让我们的代码更加优秀,这个准则就是:“一次只做一件事情”。无论是一个函数,还是一个代码块,都应该遵守这一原则。这会极大地降低代码的复杂度,让阅读和维护也变得极其方便。

写在后面的话

能比较好的做好以上几点,你写的代码,基本上算是比较专业了。当然,这也只是高质量代码的第一步,技术追求本就任重而道远。这里,还有一个大家容易起争论的地方,那就是可读性和性能的抉择,很多可读性的优化,其实并不是性能的极致最优解。这个如何决断呢?我们下篇讨论。

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000570s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.014822s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000516s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000569s ]
  8. SELECT * FROM `article` WHERE `id` = 468242 LIMIT 1 [ RunTime:0.000474s ]
  9. UPDATE `article` SET `lasttime` = 1770510819 WHERE `id` = 468242 [ RunTime:0.003618s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000234s ]
  11. SELECT * FROM `article` WHERE `id` < 468242 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000519s ]
  12. SELECT * FROM `article` WHERE `id` > 468242 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004484s ]
  13. SELECT * FROM `article` WHERE `id` < 468242 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001685s ]
  14. SELECT * FROM `article` WHERE `id` < 468242 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003284s ]
  15. SELECT * FROM `article` WHERE `id` < 468242 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000893s ]
0.142465s