From: Chris Morris <chrismo@...>
Date: 2002-09-04T02:00:18+09:00
Subject: Re: Ruby aesthetics

> I must confess to a lack of Ruby guru-ness.  It would be a great tutorial
if
> someone would be gracious enough to give a token-by-token (blow-by-blow
> sounds so violent) commentary on what Reimer just wrote.

Don't know if the following is enough commentary, but here goes:

> > module Enumerable

this module is included in many classes like Array - therefore this new
method would automatically be added to every class that includes Enumerable

> >   def condmap
> >     result = []

initialize the result to an empty array

> >     each do

call the each method passing the do..end block

> >       | elem |

the element passed into the block from the each iterator

> >       item = yield elem

yield elem to the block passed into condmap. Set item to the result of that
block

> >       result << item unless item.nil?

append item to the results array unless item is nil

> >     end
> >     result

return the result array

> >   end
> >
> > end
> >
> > To be used as follows:
> >
> >     squares_less_than_10 = numbers.condmap{|x| x**2 if x < 10 }

Chris
http://clabs.org