From: Reuben Grinberg <reuben.grinberg@...>
Date: 2007-04-14T00:20:06+09:00
Subject: Re: conditional statements within test method parameters?

aidy.lewis@googlemail.com wrote:
> hi,
> 
> I have a test method that writes some xml. The second parameter is
> optional, the first parameter is boolean.
> 
> <snip>
> test_results((assert(REMEMBER_ME.isSet?)), *msg)
> </snip>
> 
> Would it be possible to embed a conditional statement between these
> parameters
> 
> Something like:
> 
> <snip>
> test_results((assert(REMEMBER_ME.isSet?)), unless 'the object is not
> set') ?
> </snip>
> 
> cheers
> 
> aidy
> 

Yes, but it's not necessarily pretty:

def test(one, *two)
	puts one
	two.each { |t| puts t}
end

irb> test("bob", "jack", "andy")
bob
jack
andy
irb> test("bob")
bob
irb> some_condition = false
irb> test("bob", some_condition ? ["jack", "andy"] : [])
bob
irb>

The "optional" argument is actually a list, so passing in the empty list 
for it is the same thing as not passing it in.

Cheers,
Reuben