From: Dave Burt <dave@...>
Date: 2007-08-18T21:54:58+09:00
Subject: Re: Emulating a Groovy feature?

John Wells wrote:
> Guys,
> 
> There's something called Safe Navigation in Groovy (http://groovy.codehaus.org/Statements#Statements-Safenavigation) that I find very appealing.
> 
> So, Groovy will allow you to safely walk an object graph, even if that graph has nulls in it (the walk will short circuit): 
> 
> def foo = null
> def bar = foo?.something?.myMethod()
> assert bar == null
> 
> Is there an easy way to hack an equivalent out in Ruby?

irb(main):001:0> def nil.method_missing(*_) end
=> nil
irb(main):002:0> nil.a.b.c
=> nil

Cheers,
Dave