From: Josh Cheek <josh.cheek@...>
Date: 2011-03-30T06:50:24+09:00
Subject: Re: Why can a floating point number be used as an array index?

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On Tue, Mar 29, 2011 at 3:59 PM, Xavier Noria <fxn@hashref.com> wrote:

> On Tue, Mar 29, 2011 at 10:38 PM,  <me@kmwhite.net> wrote:
>
> > It may do integer truncation, but we need to think of what an Array
> > actually is as far as the structure goes. What would one expect to get
> out
> > of [0,1,2][0.3] ? Should it be 30% of the first element? That doesn't
> seem
> > right.
>
> Well, alternatively you could get an error.
>
>
Seems a lot more reasonable, using floats could introduce errors:


# almost one
123.6 - 123 + 0.4             # => 0.9999999999999943

# but truncates to zero
(123.6 - 123 + 0.4).truncate  # => 0

# do the same math with integers
(1236 - 1230 + 4) / 10        # => 1

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