From: Sven Schwyn <svoop@...>
Date: 2008-01-11T01:21:26+09:00
Subject: Re: IF me like Ruby does

Here's a version that's easier to read. Assume you want to concat A and 
B with a space in between provided the method add_B? returns true.

'A' + ((add_B?)?(' B'):(''))

The closest alternative I came up with:

['A', (' B' if add_B?)].join

The more generic form, however, will not do the trick:

['A', ('B' if add_B?)].join(' ')

However, this adds a tailing space if add_B? returns false.
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