From: "DanDiebolt.exe" <dandiebolt@...>
Date: 2008-09-12T23:22:35+09:00
Subject: Re: Redefe each to include each_with_index and arity=2

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Thanks for pointing this out. I have two motivations to pursue this:=20

1) I am interested in more deeply learning all of ruby language constructs =
but I only occasionally write my own classes & iterators. I would like to g=
et the the point where I can do this with ease.

2) As a practical matter I often have to modify code I wrote a while ago th=
at was originally thrown together for a quick solution to a one of a kind p=
roblem. So I like to use editing techniques that can quickly modify code wi=
thout of a lot of rework. It may seem trivial, but is sure seems to me that=
 adding an index parameter to the each iterator is a lot easier than changi=
ng the method to each_with_index AND adding an index parameter. In other wo=
rds, moving from this code:

a.each do |item|
=A0 #process item
end

to this code:

a.each do |item,index|
=A0 #process item & index
end

is easier to remember and edit than using this code:

a.each_with_index do |item,index|

=A0 #process item & index

end

So if Ruby is such a great dynamic language and DSL (I know it is!) there s=
hould be a straightforward way to accomplish this despite the *args problem=
 you mention.

So does anyone know how each could be expanded in this fashion to work for =
all enumerable types (ranges, hashes, sets ...)?

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