From: John Joyce <dangerwillrobinsondanger@...>
Date: 2007-03-23T20:37:46+09:00
Subject: Question about if in Ruby

I've seen this in Rails, but it is just ERb, so it is Ruby...


<%= link_to 'Previous page', { :page =>  
@product_pages.current.previous } if @product_pages.current.previous %>


I'm curious how it is different from this...


<%=  if @product_pages.current.previous link_to ('Previous page',  
{ :page => @product_pages.current.previous })
	end
  %>


I've seen this kind of if statement reversal a few times now in Ruby  
code. I call it do-if because it looks similar to do-while, but I am  
curious if reversing the condition affects the interpreter's speed at  
all. If they are the same, then isn't the standard if conditional  
better for human legibility and understanding?