相关疑难解决方法(0)

何时a未定义,a || 1则会抛出错误,但a = a || 1不会.这有点不一致吗？

irb(main):001:0> a
NameError: undefined local variable or method 'a' for main:Object
        from (irb):1
        from c:/ruby/bin/irb:12:in '<main>'

irb(main):002:0> a || 1
NameError: undefined local variable or method 'a' for main:Object
        from (irb):2
        from c:/ruby/bin/irb:12:in '<main>'

irb(main):003:0> a = a || 1
=> 1