Comments on: Extending _why’s Creature class

By: Mark McGranaghan » Blog Archive » Bookmarks: August 4th through August 5th

Mon, 06 Aug 2007 00:44:49 +0000

[...] Even ruby has problems, or, How to hack optional parameters for blocks [...]

By: Dr Nic

Dr Nic — Mon, 28 Aug 2006 23:42:46 +0000

Bad formatting! I’ll add the example to the body where formatting is respected.

I’m glad blocks can take splatted arguments. I don’t think I knew they could til now. Cool.

By: Chris

Chris — Mon, 28 Aug 2006 21:57:32 +0000

Hey, formatting.

By: Chris

Chris — Mon, 28 Aug 2006 21:56:11 +0000

Hi Dr Nic. Nice write up. Just wanted to mention that it’s possible, but some would argue less clean, to do optional parameters with a define_method block. Splat the block, yeah.

def self.traits( *arr )
arr.each do |a|
metaclass.instance_eval do
define_method( a ) do |*val|
val = val.first
@traits ||= {}
return @traits[a] if not val
@traits[a] = val
end
end
end