From: "Peña, Botp" <botp@...>
Date: 2006-08-07T18:26:03+09:00
Subject: Re: inject does not inject last value

fr Ryan:
[snipped cool samples]
# Because sum was assigned initially outside of the inject, it is an  
# lvar (local variable) instead of a dvar (dynamic/iter var, like e).  
# You'll notice that the assignments to both of those variables 
# happens  
# before the call, and is part of the iteration mechanics 
# itself. There  
# is no assignment done at the end of an iteration.
# 
# I think it is more important to point out that inject is  
# _just_another_iterator_. There is nothing special about it or how it  
# works. It is just a simple each just like everything else in  
# Enumerable. This makes the ruby implementation cleaner and easier to  
# maintain. Sum isn't an accumulator, as much as it is just another  
# variable. Should map or reject have some special semantics attached  
# to their block variables?
# 
# If you really are stuck on this idea, you can always change "sum+e"  
# to read "sum+=e" but at that stage, why use an inject at all?
[snipped code explanation]

Hi Ryan, thank you for the very detailed and enlightening explanation. I apologize for being too dumb on this inject stuff (<banging head>).

kind regards -botp