From: John Labovitz <johnl@...>
Date: 2006-09-24T15:31:27+09:00
Subject: Re: Help w/ Codegolf Total Triangles- reading input

On Sep 23, 2006, at 11:12pm, Drew Olson wrote:

> Thanks for the help...and with respect to white space, I apologize, I
> was in the codegolf mindset and trying to conserve bytes.
> http://www.codegolf.com

Ah, then the compression is forgiven. ;)

> Also, can you explain to me the difference between map and each?

#each just evaluates the block for each element of the list (or  
whatever you're iterating over).  You don't usually use the return  
value of #each.

#map (aka #collect) also evaluates the block for each element, but  
returns a new list containing the return value of each evaluation.   
It's good for translating one set of values to another, like you were  
doing in your code.

--John