[jruby-user] Re: rescue error?

Hey Keith, thanks.

Doing something like this:

if system('which factor'); puts 'Yes factor' else 'No factor' end

is much cleaner and transportable.

I tested it on my system with MIR (1.8.7, 2.1.2, 2.2.1), JRuby-1.7.19
and Rubinius-2.5.2, and there were no problems. I'll try it later on my
Win7 system with Rubyinstaller rubies.

FYI, I started out using the RUBY_PLATFORM value to check against, but
soon realized I would have to know if 'factor' runs on all the possible
ruby platforms to make if universally transportable, so I started
checking directly for 'factor' being on a platform. In Unix 'factor' has
been standard since 1974, and in Linux and BSD since their inception, so
I'm not too concerned about possible false positives on other platforms.

https://en.wikipedia.org/wiki/Factor_(Unix)

The still open question, though, is JRuby's non-conformist to MRI
behavior handling rescue in the original example. This can obviously
have catastrophic consequences for people expecting their MRI code to
operate the same on JRuby.

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