From: John Sikora <john.sikora@...>
Date: 2010-08-18T13:06:39+09:00
Subject: Re: Strange behavior of or condition in loop

AppleII717 wrote:
> I don't understand why ruby's "or" acts differently in a loop.
> 
> This is some code I pulled out of a rails model, expanded the
> assignments and simulated in IRB (1.8.7 and 1.9.2rc)
> 
> #simple boolean assignments
> #Why does this work
> 
>   dirty = false
>   found = true
>   dirty = dirty or found
>   puts dirty.to_s  => true
> 

A lot of great info in here but I was left with a question:

Why did it work outside the loop (in the example given above) but not 
inside the loop? So I tried the inside the loop code both in irb and 
from a file (using 1.9.1) and I got false, not true. See the irb session 
below. It makes me feel better that it works the same way in both 
instances.

AppleII717, are you sure you got 'true' in the code above? Note that 
there is a 'true' output, but I think that it is because (dirty = dirty) 
or found returns true, but dirty is false.

irb(main):001:0> dirty = false
=> false
irb(main):002:0> found = true
=> true
irb(main):003:0> dirty = dirty or found
=> true
irb(main):004:0> dirty
=> false
irb(main):005:0> dirty.to_s
=> "false"
irb(main):006:0>

js
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