有条件的经营者VS如果当时其他 [英] Conditional operator vs if then else

问题描述

如果我要实现一些条件code，可以在两者的方式来实现。那么哪种方式更好条件运算符：或if..then..else ??

If I want to implement some conditional code that can be implemented in both of the ways. Then which way is better conditional operator ?: or if..then..else??

推荐答案

这要看情况。一般情况下，你想活动的主要流程
是在code的结构psented重新$ P $。如果关键点
该算法是变量 X 初始化，然后
最好的解决办法是使用条件运算符：

It depends. In general, you want the major flow of activity to be represented in the structure of the code. If the key point of the algorithm is that the variable x is initialized, then the best solution is to use the conditional operator:

x = condition ? f1() : f2();

如果决定是至关重要的问题对于理解是什么
怎么回事，然后你就会preFER的如果。在实践中，这意味着
当两者都是合理的可能，你会使用：。该
键为合理＆MDASH;如果你发现你正在使用的
逗号操作符在SUBEX pressions的SUBEX pressions有
副作用，然后用：很可能不是合理。

If the decision is the critical issue for understanding what is going on, then you'll prefer the if. In practice, this means that when both are reasonably possible, you'll use ?:. The key being "reasonably"—if you find that you're using the comma operator in the subexpressions, of the subexpressions have side effects, then using ?: is probably not "reasonable".

当你使用：运营商，但在所有的最简单
的情况下，你应该确切地格式化它，你会在如果，例如：

When you do use the ?: operator, in all but the simplest cases, you should format it exactly as you would an if, e.g.:

x = condition
    ? complex_expression_1
    : complex_expression_2;

我经常这样做。 （有一个特殊的情况下我会推
它：如果我可以向下降低整个功能单一的回报
声明。我仍然不会允许逗号的副作用
运营商，但我有时会用更复杂的前pressions
比我原本可以达到的。）

I do this regularly. (There's a special case where I'll push it: if I can reduce the entire function down to a single return statement. I still won't allow side effects of the comma operator, but I will sometimes use more complicated expressions than I otherwise would.)

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