From: Daniel Finnie <danfinnie@...>
Date: 2007-02-20T22:47:44+09:00
Subject: Re: [Facets] Range#overlap?

That seems to be what facet/range/within does now.

daniel@daniel-desktop:~$ irb
 >> require 'facet/range/within'
=> true
 >> (1..3).within?(0..4)
=> true
 >> (0..3).within?(0..4)
=> true
 >> (-1..3).within?(0..4)
=> false
 >> (1..4).within?(0..4)
=> true
 >> (1..5).within?(0..4)
=> false

Whereas overlap?, IMHO, would return true to all of these.  In the cool 
ASCII diagrams, it would be like this:
    |-----| a
|----| b
a.overlap? b #=> true

Dan

Daniel Schierbeck wrote:
> On Tue, 2007-02-20 at 10:56 +0900, danfinnie@optonline.net wrote:
>> I think that overlap? and within? are two different things, which I'm not sure you think from your email. Overlap? suggests, to me, that a subset of the things one range includes is the same as a subset of things that the other range includes. Within? suggests that all of one range is contained in a subset of the other range.
> 
> Exactly, but that's not how it's implemented in Facets ;)
> 
> I don't like #within? because it seems closer to #in? than to #include?.
> a.within? b suggests the following:
> 
>   a  |-----| 
>   b |-------|
> 
> I'd much rather have something else... #span?, perhaps? 
> 
> 
> Cheers,
> Daniel
> 
> 
>