CODEWITHSUNDEEP
rubycase
B Seven
B Seven

Reputation: 45943

How to access the argument to a case statement in Ruby?

make_api_call is an expensive resource.

response = make_api_call

case response
when Net::HTTPSuccess
  response.body
else
  'not found'
end

Is there a way to access the "case object" so that:

case make_api_call
when Net::HTTPSuccess
  ???.body

Upvotes: 2

Views: 126

Answers (1)

Dave Schweisguth
Dave Schweisguth

Reputation: 37617

I don't think there's a way to get to the argument of the case. I didn't see anything in Binding. But you can assign to a local and pass it to the case all in one go like this:

case response = make_api_call
when Net::HTTPSuccess
  response.body
else
  'not found'
end

I don't actually recommend this. (I'd just write it as in the question.) It doesn't scope response to the case and it causes a Ruby warning (although so do a lot of not genuinely incorrect things). But people whose code standards allow or encourage assignments in conditionals might prefer it to separate assignment.

Upvotes: 1

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