From: Dan Diebolt <dandiebolt@...>
Date: 2008-03-26T23:43:13+09:00
Subject: Re: The inject function

--0-687794272-1206542600=:14249
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

> I want to add together numbers in an array with the inject command. I
want only the even numbers using only inject.

a=[1,2,3,4]
a.inject(0) {|x,y| y % 2 == 0  ? x+y : x}
=> 6

>Second, I need to reverse an array using only the inject command. So,
something like above with the result [4,3,2,1]

a=[1,2,3,4]
a.inject([]) {|x,y| x.unshift(y)}
=> [4, 3, 2, 1]

It seems like an artificial requirement to use only "inject".

--0-687794272-1206542600=:14249--