From: Charles Oliver Nutter <headius@...>
Date: 2010-01-22T07:29:11+09:00
Subject: Re: an elegant way to modify all lines from file by using map() 	function?

On Thu, Jan 21, 2010 at 4:20 PM, RobertGawron <mojwpisdao@gmail.com> wrote:
> but in your language I didn't find the way to create in one step array
> of all lines from file, that could be used by map(). If I really want
> to use map in this situation I have to use secondary array (called
> arr) like in this snippet?
>
> arr = Array.new
> File.open('foo').each_line{ |l| arr.push l }
> p arr.collect{ |l| l.upcase }

On 1.8.7+, you can use .lines to get an Enumerator:

p File.open('foo').lines.map {|l| l.upcase}

- Charlie