ruby 's instance variable

最新推荐文章于 2020-09-15 07:05:40 发布

threewells_14

最新推荐文章于 2020-09-15 07:05:40 发布

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本文介绍了Ruby中的四种变量类型：全局变量、实例变量、局部变量和常量，并详细解释了实例变量与类变量的区别。实例变量属于每个类实例，而类变量则被所有类实例共享。

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ruby has 4 kinds of variables,

`$`	global variable
`@`	instance variable
`[a-z]` or `_`	local variable
`[A-Z]`	constant

I found instance variable always come out in a class, which made me confused what's the difference between class variable and instance variable.

Some things like this is java, a pure OO language. The key point is that, instance variable is for differing class static variable from itself. class static variable is shared by all instance of the class, while instance variable is owned by every class instance.