From: TerryP <codemonkey@...>
Date: 2007-11-23T12:45:00+09:00
Subject: Re: operators in ruby

Martin Durai wrote:

> How to use logical operators in ruby?
> 
> Logical AND, OR, NOT..
> 
> In other languages like java &&, ||, ! is used. how we have to use it in
> ruby.
> 
> A sample code in java, please explain it in ruby.
> 
>      if((namespace == attributeUri[ i ] ||
>                         namespace.equals(attributeUri[ i ]) )
>                        && name.equals(attributeName[ i ]) )
> 
> Please do the same in ruby
> 
> Thanks in advance

It's just a matter of preference, use english or C-style symbols. The C-Stye
has precedence over the keyword versions (e.g. || rather then 'or' ). 

Operators and Precedence (Top to bottom)
:: .
[]
**
-(unary) +(unary) ! ~
*  /  %
+  -
<<  >>
&
|  ^
>  >=  <  <=
<=> == === != =~ !~
&&
||
.. ...
=(+=, -=...)
not
and or

All of the above are just methods except these:
=, ::, ., .., ..., !, not, &&, and, ||, or, !=, !~

In addition, assignment operators(+= etc.) are not user-definable.