From: "Albert L. Wagner" <alwagner@...>
Date: 2002-01-19T04:32:43+09:00
Subject: dynamic method creation

I have a need to dynamically create methods with method names
that are not known until run time.  Below is my current best
shot.  Is there a better way? If methods allowed expressions as
names, and not just as qualifiers, I wouldn't need the eval.

class Record
	def initialize(name)
		@name = name
	end	
end

fieldNames = ['abc', 'dof', 'ghi']
fieldTypes = ['String', 'Fixnum', 'Float']
rec = Record.new('aRecord')
class << rec 
end
fieldNames.size.times do | i |
	f = fieldNames[i]
	defStr = "def rec.#{f}=(obj)\n" 
	case fieldTypes[i]
		when 'String'		then defStr << "@#{f} = obj\n"
		when 'Fixnum'		then defStr << "@#{f} = obj\n" 
		when 'Float'		then defStr << "@#{f} = obj\n"
	end
	defStr << "end\n"
	puts defStr
	eval defStr
end
p rec.abc=(nil)
p rec.dof=(nil)
p rec.ghi=(nil)
p rec.methods

-- 
"It requires wisdom to understand wisdom:
 the music is nothing if the audience is deaf."
 - Walter Lippman