From: Marcello Barnaba <bofh@...>
Date: 2007-02-15T05:02:09+09:00
Subject: Re: Drying a ternary condition

Hi,

On Wednesday 14 February 2007 19:53, Rob Biedenharn wrote:
> The other responders would call klass.down when ARGV[0] is false/
> nil.  Also you can't call nil.to_sym (as you probably learned from
> ARGV[0].to_sym raising a NoMethodError) or "".to_sym (ArgumentError
> for the empty string).

yup :) exactly. thanks for pointing this out.

> klass.send(Hash.new(:down).merge!({:up=>:up})[(ARGV[0].to_sym �
> rescue :up)])

> Yuck! �Stick with the simple ternary for your statement (although you �
> might want to use the rescue trick instead of just ||).

that's right, with the rescue i'll be sure that even when some not nil? object 
that doesn't respond_to?(:to_sym) is passed, no exception is being raised. 

but i'll go with Robert's `case', because it doesn't send to_sym, has just two 
`up' in a row, and it doesn't use the (heavily abused by myself in the past, 
i feel guilty) ternary operator.

:)
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