From: Brian Candler <B.Candler@...>
Date: 2007-08-06T19:15:19+09:00
Subject: Re: pulling specific dup. elements out of an array

> > why didn't reject work?
> > 
> >>> array =  ['234234','04593','4098234','0','0','0']
> > => ["234234", "04593", "4098234", "0", "0", "0"]
> >>> array.reject {|e| e == '0' }
> > => ["234234", "04593", "4098234"]
> 
> well lemme further explain what im attempting to do and why i couldnt 
> get reject to work right, i need to delete all the 0's in the array then 
> add up those non-zero numbers.
> with:
> 
>  array.inject(0) {|num, i| num + i}/array.length/1024   #1024 = 
> kilobytes convert
> 
> so if theres a way to shove reject into that then lemme know ^^

Just do the reject first (use reject! if you want to modify the array
in-place), and then run your inject on the results of that.

If you prefer to do it all in a single functional-style inject, then I guess
you can do something like this:

array = ['234234','4593','4098234','0','0','0']

sum, len = array.inject([0,0]) { |(sum,len),i|
  i != '0' ? [sum+Integer(i),len+1] : [sum,len] }

puts sum / len / 1024