三元语句比javascript中的if / then / else语句更快吗？ [英] Are ternary statements faster than if/then/else statements in javascript?

问题描述

我看到了很多：

var something = (is_something_true()) ? 3 : 4;

。这比

var something;
if (is_something_true()) {
    something = 3;
} else {
    something = 4;
}

还是为方便起见而写得简洁？

Or is it written concisely for convenience?

推荐答案

请享受这一点 - 如果差异在统计上有效，那么结果（真或假）也很重要 - 显然这只是机器上的其他东西对浏览器性能的影响：

Please enjoy this -- if difference is statistically valid then the result (true or false) also matters -- clearly this is just other stuff on the machine having an impact on browser performance:

这是链接

两者之间存在根本区别，三元语句是表达式而不是控制流。如果有人将其写为三元表达式而不是标准if / than / else，当两者都工作相同时，他们（在我看来）会使代码更难以无理由地阅读。

There is a fundamental difference between the two, the ternary statements are expressions and not flow of control. If there is a case where someone writes it as a ternary expression instead of a standard if / than / else, when both would work the same they are (in my opinion) making the code harder to read without good reason.

就速度而言，应该没有区别。除非你使用一个非常糟糕的JavaScript实现。两个语句中最慢的部分是分支。

In terms of speed there should be no difference. Unless you are using a really bad javascript implementation. The slowest part of both statements is the branching.

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