A Workaround To A Near Miss

Published 02 November 2008 by Farrel

In my previous article I discussed how I thought Symbol#to_proc and Proc#=== would work nicely together but ran into syntax and semantic issues. Here’s how to get round that using a function that returns dynamically created Proc objects.

 1 def it_is( property )
 2   Proc.new{ |object| object.send( property )}
 3 end
 4 
 5 case number
 6 when it_is( :even? )
 7   puts "Even!"
 8 when it_is( :odd? )
 9   puts "Odd!"
10 when it_is( :zero? )
11   puts "Zero!"
12 end

Farrel Lifson is a lead developer at Aimred.