Ruby类变量 [英] Ruby class variables
本文介绍了Ruby类变量的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
ruby类实例的东西让我头痛。我明白这个...
class Foo
@var ='bar'
end
... @var
是一个变量
这里是创建类的实例。
我将在Python中做的一个例子:
class Fish:
/ pre>
var ='fish'
def v(self):
return self.var
class Trout(Fish):
var ='trout'
class Salmon :
var ='salmon'
print Trout()。v()
print Salmon().v()
哪些输出:
trout
salmon
如何在ruby中做同样的事?
解决方案检查这篇文章,它真的解释了它的深入。
基本上,如果你想继承,那么使用一个实例变量。
The ruby class-instance stuff is giving me a headache. I understand given this...
class Foo @var = 'bar' end
...that
@var
is a variable on the created class's instance.But how do I create a sub-class overridable class variable?
Here is an example of what I would do in Python:
class Fish: var = 'fish' def v(self): return self.var class Trout(Fish): var = 'trout' class Salmon(Fish): var = 'salmon' print Trout().v() print Salmon().v()
Which outputs:
trout salmon
How do I do the same thing in ruby?
解决方案Check this article out, it really explains it in-depth.
Basically, if you want inheritance then use an instance variable.
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