From: Joseph Abrahamson <abrahamson.j@...>
Date: 2006-05-21T15:03:22+09:00
Subject: Re: rubynuby - confused by method name "inject"

In Common Lisp there is the reduce function. I think that name 
appropriately qualifies the action involved.

(reduce (function +) (list 1 2 3 4 5 6))

(1..6).inject(0) {|c,v| c + v}

Also: yes, the "E" in math is a Sigma or summation. I wouldn't say 
they're quite the same since summnation always involves summing whereas 
inject/reduce are more abstract and multipurpose.

Ex:
(reduce (function *) (list 1 2 3 4 5 6))
(1..6).ineject(1) {|c,v| c * v}
These both act more like a factorial than a sum.

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