Scala-布尔值-&与&amp ;, | vs || [英] Scala - Booleans - & vs &&, | vs ||

问题描述

我刚刚注意到在Scala中，Boolean支持&和&&.这两个运算符之间有区别吗? Scala文档对两者都使用完全相同的描述，所以我不确定.

I just noticed that in Scala Boolean supports both & and &&. Is there a difference between these two operators? The Scala docs use the exact same description for both of them, so I wasn't sure.

推荐答案

&和|是严格的，而&&和||却是短路的:

& and | are strict while && and || are short-circuiting:

false && (throw new Exception()) => false
false & (throw new Exception()) => ex

true || (throw new Exception()) => true
true | (throw new Exception()) => ex

&和|的完整文档有注释来解释此行为:

The full documentation for & and | have a note explaining this behaviour:

即使结果已经存在，此方法也会同时评估a和b 在评估a之后确定.

This method evaluates both a and b, even if the result is already determined after evaluating a.

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