“或"之间的区别和 ||在红宝石? [英] Difference between "or" and || in Ruby?

问题描述

Ruby 中的 or 和 || 运算符之间有什么区别?还是只是偏好?

What's the difference between the or and || operators in Ruby? Or is it just preference?

推荐答案

这是运算符优先级的问题.

It's a matter of operator precedence.

|| 的优先级高于 或 .

因此，在这两者之间，您还有其他运算符，包括三元 (? :) 和赋值 (=)，因此您选择哪一个会影响语句的结果.

So, in between the two you have other operators including ternary (? :) and assignment (=) so which one you choose can affect the outcome of statements.

这是一个ruby 运算符优先级表.

参见这个问题，了解另一个使用and/<的示例代码>&&.

See this question for another example using and/&&.

另外，请注意可能发生的一些令人讨厌的事情:

Also, be aware of some nasty things that could happen:

a = false || true  #=> true
a  #=> true

a = false or true  #=> true
a  #=> false

前两条语句的计算结果都是 true，但是第二条语句将 a 设置为 false，因为 =优先级低于||但高于or.

Both of the previous two statements evaluate to true, but the second sets a to false since = precedence is lower than || but higher than or.

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