From: Alex Young <alex@...>
Date: 2011-12-05T20:11:50+09:00
Subject: [ruby-core:41491] Re: [ruby-trunk - Feature #5695][Open] CoffeeScript "is" and "isnt" keywords

On 01/12/11 18:52, Suraj Kurapati wrote:
> 
> Issue #5695 has been reported by Suraj Kurapati.
> 
> ----------------------------------------
> Feature #5695: CoffeeScript "is" and "isnt" keywords
> http://redmine.ruby-lang.org/issues/5695
> 
> Author: Suraj Kurapati
> Status: Open
> Priority: Normal
> Assignee: 
> Category: 
> Target version: 
> 
> 
> Hello,
> 
> Please add "is" and "isnt" keywords, which behave like the "==" and "!=" operators respectively, to Ruby.  These keywords come from the CoffeeScript language.  They are useful to prevent accidental assignment (forgetting a "=" in "==") and they preserve reading order, unlike inverted "if 5 == x" expressions known as "Yoda conditionals".


Wouldn't it make more sense to have "is" use "==="?  Then you could say,
for instance, "if x is Numeric".  "is" could then be syntax sugar for
"case...when", and "isnt" could be implemented as the corresponding "else".

-- 
Alex