ruby中的布尔逻辑'true and false == true' [英] boolean logic in ruby 'true and false == true'

问题描述

> test = false and true
=> false
> test
=> false
> test = true and false #this is the point I don't understand!
=> false
> test
=> true

为什么红宝石会以这种方式表现，我将如何正确使用它以免遇到此问题?

Why does ruby behave in this way and how would I use it correctly to not run into this problem?

推荐答案

优先级. test = true and false意味着:

(test = true) and false  

不是这个:

test = (true and false)

使用上面的括号，或者，如果要分配到最后，请使用&&代替and:

Use parentheses as above, or && instead of and, if you want the assignment to come last:

test = true && false

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