From: Stefan Lang <perfectly.normal.hacker@...>
Date: 2008-08-05T05:04:27+09:00
Subject: Re: Whose fault is my problem?

2008/8/4 Daniel Moore <yahivin@gmail.com>:
> On Mon, Aug 4, 2008 at 7:38 AM, The Podman <poddster@gmail.com> wrote:
>
>> * Float == Float does not perform any delta difference checking. In a
>> way, this is expected. In another way, it's not.
>
> If you don't like the == method of Float just crack it open and change it:
>
> a = 12.60000000000001
> b = 12.59999999999999
>
> puts a
> puts b
>
> puts a == b   # => false
>
> class Float
>  def ==(other)
>    fuzz = 1.0E-10
>    max = [self.abs, other.abs].max
>    ( self - other ).abs / max < fuzz
>  end
> end
>
> puts a == b # => true
>
> I would only recommend doing this for your tests though, ...

I think that's a bad strategy. If he has == comparisons of Float
in his code where a delta check would be the right thing,
this would hide it from the tests.

Stefan