Re: how to pass a variable to a method in an existing class?

--Marcin's way is perfect; but there is something we don't understand
about your requirement:

"...I want to use the string as a variable

def convert(x)
> #code to convert the x
..."

then..."in the irb I can use the new method in the way as:
>
> "a".convert <---what's happened to ur variable x???

Best Regards,


frank hi wrote in post #1019491:
> Hi,
>
> I am a new ruby user and I want to add a function to an existing class.
> I googled the answer and found part of the solution. All findings on the
> web adding a new method without a variable. In my case I want to use the
> string as a variable. Here is what I want to do:
> class String
>
> def convert(x)
> #code to convert the x
> x.upcase
> end
> end
>
> What I want is in the irb I can use the new method in the way as:
>
> "a".convert
>
> This will convert a to upper case. However, it does not take the "a" as
> the input variable and generating error
> ArgumentError: wrong number of arguments (0 for 1)
>
> How do I acheive what I want?
>
> Thanks
>
> Frank

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