From: Louis J Scoras <louis.j.scoras@...>
Date: 2006-11-17T00:55:15+09:00
Subject: Re: Design problem with 'inject'

> This works fine
>
> sum = 0
> arr = (1..10).to_a
> arr.inject(0) { |sum, i|  sum += ( i == 3 ? 0 : i ) }   => 52
>

The assignment to sum is useless.  Only the return value matters to inject.

    arr.inject(0) { |sum, i|  sum + ( i == 3 ? 0 : i ) }

Does the same thing.  Actually, its more correct.  The above is only
doing what you want because an assignment returns the value it assigns
to:

    sum += i
    sum = sum + i
    sum + i  #evaluates to this after side-effect


-- 
Lou.