Hey,
I wrote a line of code that I thought was correct (but maybe not so pretty) and
in one case it was giving me a weird error. I was wondering if someone could
explain to me what is wrong with it; I suspect there is some behaviour of
MacRuby that I am not understanding. Here are a few examples that are close to
what I had:
A working case: (Case #1)
require 'uri'
test = URI.parse url unless (url = nil).nil? # works, as I expected,
url is nil and the left side is not evaluated
Ok, try again, but without a nil value for url: (Case #2)
require 'uri'
test = URI.parse url unless (url = 'http://macruby.org/').nil? #
error about url not being defined
Now, when I try this out in macirb: (Case #3)
require 'uri'
test = URI.parse url unless (url = 'http://macruby.org/').nil? #
error again
test = URI.parse url unless (url = 'http://wikipedia.org/').nil? #
works fine this time
puts test.to_s # gives me the wikipedia value
If it doesn't work in the second case, why does it start working in the third
case?
Thanks,
Mark
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