“或"与“或"之间的差异.和||在Ruby中? [英] Difference between "or" and || in Ruby?

问题描述

Ruby中的or和||运算符有什么区别?还是只是偏爱?

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or.

因此，在这两者之间，您还有其他运算符，包括三元运算符(? :)和赋值运算符(=)，因此您选择的哪个运算符会影响语句的结果.

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 ruby​​运算符优先级表.

有关使用and/&&的另一个示例，请参见此问题.

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

前两个语句的求值结果均为true，但是第二个语句将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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