From: Adam Prescott <mentionuse@...>
Date: 2011-03-03T19:42:02+09:00
Subject: Re: What is inject doing here?

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On Thu, Mar 3, 2011 at 2:15 AM, Todd Benson <caduceass@gmail.com> wrote:

> irb(main):002:0> (0..3).inject {|s, i| a = i%2 == 0 ? 1 : -1; p a}
> -1
> 1
> -1
> => -1
>

Why is this done using inject? s is never used in the block, but since `p a`
returns nil, s would be nil in every iteration after the first one.

(0..3).map { |n| n % 2 == 0 ? 1 : -1 }.each { |n| puts n }

You could of course just use each by itself:

(0..3).each do |n|
  if n % 2 == 0
    puts 1
  else
    puts -1
  end
end

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