From: Logan Capaldo <logancapaldo@...>
Date: 2006-08-27T11:32:43+09:00
Subject: Re: and and or priority

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On 8/26/06, Elliot Temple <curi@curi.us> wrote:
>
>
> On Aug 26, 2006, at 8:16 AM, David Vallner wrote:
>
> > I agree that the and should bind more tightly than or now that
> > that's been brought up.
>
> && binds before ||
>
> Presumably there is a special reason for and/or to be the way they
> are. We should probably find out what it is before suggesting it be
> changed.


The general idea is that you can use and and or in similiar places as if and
unless modifiers (ala "or die" in perl, at least as far as I understand it)

e.g. x = string.index("h") or raise "No h in string!"

Also with left to right equal precendence you can use them as a ternay
operator:

x = condition and value or other_value



irb(main):025:0> true or true and false
> => false
> irb(main):026:0> true || true && false
> => true
>
>
> -- Elliot Temple
> http://www.curi.us/blog/
>
>
>
>
>

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