一个函数里面用一个return 好 还是多个return 好?
<code><?php function dmeo1($num) { if($num>0) { return true; } else { return false; } } function dmeo2($num) { $status = null; if($num>0) { $status = true; } else { $status = false; } return $status; } </code>
回复内容:
<code><?php function dmeo1($num) { if($num>0) { return true; } else { return false; } } function dmeo2($num) { $status = null; if($num>0) { $status = true; } else { $status = false; } return $status; } </code>
尽早return,不要走多余的流程
<code>php</code><code>// 一般情况 function foo($num) { if ($num>0) { return true; } return false; } // 特殊情况:正好需要返回bool值 function bar($num) { return $num>0; } </code>
你的代码很好,我帮你重写了一遍:
原始代码:
<code>javascript</code><code>function dmeo1($num) { if($num>0) { return true; } else { return false; } } </code>
重写一遍:
<code>javascript</code><code>function dmeo1($num) { flag = $num > 0; if(flag === true) { return true; } else { return false; } } </code>
代码思路瞬间清晰了。
多少return没关系,要保持代码的高度简洁易懂
<code>function dmeo($num) { return $num > 0; } </code>
<code>function dmeo3($num) { return $num>0; } </code>
灵活的根据结构定
<code>function dmeo($num) { return $num>0; } </code>
那个没有高亮的是“returm”?
除去 guard condition 型的 return, 多个 return 是不是说明函数复杂了, 职责过多而需要重新考虑设计了.
尽早返回。。。
该return的时间就return,也没有强制说几个return不好,毕竟一个return代表的是一个逻辑片段,所以其实只要逻辑清晰,代码清晰就够了!
应该尽早输出return,这样会提高效率,就是说本来你经确定数据已得到,对于之后的代码,执行的意义也不大
同意@城南往事的看法,如果一个函数在第一行就可以return,那么就没必要等到最后一行,效率先不说,可读性绝对是有差别的!
使用哪种方式能带使代码更加清晰就使用哪种,不过通常情况下使用多个return是一个更佳的选择。
具体可以参考《重构-改善代码既有设计》9.5节的介绍。
老师说啦,程序应该一个出口,避免使用多return,break
如果程序中有很多防御性设计,在出错之后程序就要退出,那么就要在每次出错的时候直接return,否则就这样了:
如果程序就是一个算法,有确定的返回值类型,那么我认为还是一个return好:
<code>function getValue($x) { $y = 0; if ($x>0) { $y = $x*$x; } else if ($x == 0) { $y = -1; } else { $y = 1/$x; } return $y; } </code>
http://stackoverflow.com/questions/36707/should-a-function-have-only-one-return-statement
我个人觉得第一种好,如果当一个方法很长时,用return可以看出在哪里直接退出,用第二种方法的话是不是得看到最后?
<code> function dmeo2($num) { $status = false; if($num>0) { $status = true; } return $status; } </code>
我比较习惯这种写法
还是看具体情况吧,如果一些前提判断,自然需要提前返回(也就是第一种)。第二种应该是那种逻辑的操作,最后给一个执行的状态。
我更倾向于第二种,用变量去控制程序返回的结果,而不是在程序各个点直接return,程序控制,怎么会进行多余的流程呢
其实很简单,分支越少越好
为什么你们都不给他的方法改个名?
<code>function isNonNegative($num) { return $num > 0; } </code>

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