From: Todd Benson <caduceass@...>
Date: 2008-05-27T23:36:23+09:00
Subject: Re: Directionality of comparasion operators

On Tue, May 27, 2008 at 6:34 AM, Tobias Weber <towb@gmx.net> wrote:
> Hi,
> maths says that the value of expressions like x == y and y == x is
> always equal. And indeed most programmers wouldn't think twice about
> using x < y instead of y > x (except maybe those versed in machine
> language...).
> But direction does matter in ruby, where operators are just messages
> sent to the left operand. This often bites me when using ===.
>
> Have you had bugs fixable by rotating an expression?

Operators depend on context (think of the use of <).  === is no
different.  There are, after all, a limit to the symbols you want to
remember, right :-)

A number of symbols cannot be overridden during the interpretation of
a script/program, such as &&, ternary operator, assignment operators,
and several others.

When, I first saw ===, I immediately hit the docs out of curiosity,
having never seen it before, and therefore never had a problem with
it.

Todd