From: Benoit Daloze <eregontp@...>
Date: 2010-01-22T07:40:29+09:00
Subject: Re: an elegant way to modify all lines from file by using map() 	function?

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Hi,

2010/1/21 RobertGawron <mojwpisdao@gmail.com>

> Hi all,
>
> I'm new in ruby and I just have a question: in python when I want to
> read all lines from file, do something with all of them and then use
> them in my program I use map function + lambda function, sth like
> that:
>
> print map(lambda u: u.upper(), open("foo", "r").readlines())
>
> 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 }
>
> Please post a code-snippet, it's quite interesting to me :)
>
>
Waow awesome how the order is in Python...

Let's take the natural order, welcome to Ruby !

puts File.read('foo').lines.map { |line| line.upcase }
That's in ruby 1.9
Notice lines is an Enumerator, that can be converted to an Array if needed
by #to_a

You got also IO.readlines

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