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comp.lang.ruby

Re: Newbie question

Jamis Buck

12/3/2004 6:00:00 PM

Williams, Chris wrote:
> Hi all,
> I'm developing a rails web app here at work and I keep running into
> a common thing in terms of setting instance variables with the property of a
> form's parameter value. Basically I want the variable to take the
> parameter's value if it exists, and to otherwise use a reasonable default.
>
> I keep writing code like this:
> if @params["limit"]
> @limit = @params["limit"]
> else
> @limit = 50
> end
>

> if @params["chain"]
> chain = @params["chain"]
> else
> chain = 1
> end
>
> Can someone please point me to a simpler, more succinct "ruby" way of doing
> this?


The || operator works beautifully in this kind of situation:

@limit = @params["limit"] || 50
chain = @params["chain"] || 1

>
> Thanks,
> Chris
>

- Jamis

--
Jamis Buck
jgb3@email.byu.edu
http://www.jamisbuck...