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Category:Taiwanese brandsQ:
Why does this ruby instance variable behave like an instance variable?
I have an instance variable in a ruby file that I can access within the same class. For example,
class Foo
def run
# This returns bar
self.bar
end
def bar
puts "The foo is #{@foo.inspect}"
@foo = "blah"
end
def foo=(value)
@foo = value
end
def foo
return @foo
end
end
But, if I define a global variable, say, bar, and do
# outside of the class
@bar = "blah"
and then try to access the instance variable through the class, it doesn't work.
Foo.new.foo # => undefined method `foo' for #
I'm fairly new to ruby and I don't understand why that happens. Can someone shed some light on this?
A:
Ruby is a lexically scoped language, as is Java, so your @bar = "blah" is outside of run and, therefore, @bar is not defined in the scope of the Foo class.
The same is true of instance variables.
There are many ways to fix your issue, all of which boil down to the same solution: move the code that modifies @foo inside the run method.
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