From: Kent Sibilev <ksruby@...>
Date: 2006-02-09T10:38:21+09:00
Subject: Re: can map/collect return fewer values than are found in the target?

items.inject([]){|a,i| a << i unless VOWELS.include?(i); a}

Kent.

On 2/8/06, Kelly Dwight Felkins <railsinator@gmail.com> wrote:
> Is there a way for collect to return fewer items than the enumerable the
> collect is running on? It looks to me like
> map/collect will return at least one value for each item in the array --
> I've seen examples of how to return more items, but
> not less.
>
> Is there a way to do this more succinctly:
>
> VOWELS = %w{a e i o u}
> items = %w{ a b c d e f g h i}
> new_items = []
> items.each do |item|
>   new_items << item unless VOWELS.include(item)
> end
> new_items
>
> map/collect in ruby seems very similar to map in perl except that in perl
> the block can return zero or more elements. Is there an method in ruby that
> is similar to perl's map?
>
> Thanks,
>
> -Kelly
>
>