From: David Vallner <david@...>
Date: 2006-02-21T13:43:45+09:00
Subject: Re: dirty ranges

Dňa Utorok 21 Február 2006 04:38 George Ogata napísal:
> But I suggest not modifying range endpoints at all; Ranges themselves
> are immutable, so changing their value indirectly like that is kinda
> going against the grain.  And of course, if you ever modify your #end
> while iterating over the range, it's nasal demons.
>

Pffft. Doesn't even flinch.

ruby <<EOF
rng1 = ("a".."g")
rng1.each { |char|
  if char == "d"
    rng1.end[0] = "j"
  end
  puts char
}
rng2 = ("a".."j")
rng2.each { |char|
  if char == "g"
    rng2.end[0] = "d"
  end
  puts char
}
END

Outputs:

a
b
c
d
e
f
g
a
b
c
d
e
f
g
h
i
j


Of course, I have absolutely NO idea at all why, and don't particularly feel 
like reading Ruby core source.

David Vallner