From: Wybo Dekker <wybo@...>
Date: 2005-08-10T22:08:12+09:00
Subject: Re: passing a method

Robert Klemme wrote:

 > IMHO a superior solution would be to use a block instead of argument
 > option_handler.  AFAICS you have only one such callback and that's 
exactly
 > what blocks are for.  If you want access to the current instance you can
 > use instance_eval:
 >
 > def init(needed,defaults,&option_handler)
 > ....
 >    # handle options
 >    instance_eval &option_handler
 > ....
 > end

but that would need, in the calling program, something like

init(needed,defaults) { handle_options }

which I feel is less straightforward/consequent than

init(needed,defaults,:handle_options)

 > Also, for setting instance variables, this idiom is better (because it
 > avoids evil eval and you don't need special handling of nil):
 >
 > defaults.each {|k,v| instance_variable_set("@#{k}", v)}

Nice! I did'nt know about instance_variable_set yet.
Learned a lot today, thanks!

-- 
Wybo