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

问题描述

我刚刚注意到，在 Scala 中，Boolean 支持 & 和 &&.这两个运营商有区别吗?Scala 文档对它们都使用了完全相同的描述，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|| 正在短路:

& 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 | 的完整文档有一个解释此行为的注释:

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

此方法同时计算 a 和 b，即使结果已经是评估后确定.

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

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