From: Albert Schlef <albertschlef@...>
Date: 2010-02-19T16:06:44+09:00
Subject: Re: Ruby conditionals subtlety?

Farhad Farzaneh wrote:
>> I should also point out: almost all of this is of no consequence. You 
>> almost never use defined? on a local variable like this. You usually use 
>> it on a const, ivar, cvar, or global, and all of those are unambiguous.
> 
> Thanks.  I sometimes use it in Rails partials rendering, where I may 
> pass an optional local variable, but if it isn't passed, I want to set 
> it to some default value.

BTW, I wonder,

In templates, local variables are created dynamically (e.g., the 
programmer passes a hash of "variables" to the template engine). So how 
can Ruby know, in the template code, that a "name" refers to a variable? 
By default Ruby thinks names are method invocations and since there's no 
assignment, Ruby has no way to know these are variables...


-- 
Posted via http://www.ruby-forum.com/.