ruby中的布尔逻辑'true and false == true'

Question

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

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

Answer 1

Precedence. 优先顺序。 test = true and false means this: test = true and false意味着：

(test = true) and false

not this: 不是这个：

test = (true and false)

Use parentheses as above, or && instead of and , if you want the assignment to come last: 使用上面的括号，或者如果要分配在最后，请使用&&代替and ：

test = true && false

ruby中的布尔逻辑&#39;true and false == true&#39;