From: Robert Klemme <shortcutter@...>
Date: 2011-01-26T20:51:33+09:00
Subject: Re: IO from text file

On Wed, Jan 26, 2011 at 3:19 AM, Jeremy Bopp <jeremy@bopp.net> wrote:
> On 01/25/2011 04:46 PM, Michael Litton wrote:
>> I am trying to read in three strings from a .txt file. The code does
>> everything but return the values stored in the file.
>>
>> Code:
>>
>> f = File.open('productlines.txt','r')
>>
>> lines = f.readlines
>>
>> lines.each do |line|
>>
>>   test = '#{line}'
>           ^^^^^^^^^
> You need to use double quotes rather than single quotes here.  Single
> quotes are meant to be used when you are likely to be defining string
> contents that might otherwise be evaluated under double quotes.
> Basically, you can more safely avoid escaping characters that have
> special meaning.  In your case, you *want* to have the evaluation
> performed, so you need the double quotes. :-)

Note also that in this particular string evaluation is completely
superfluous since the string around #{line} is empty, i.e. adds
nothing.  Basically this is sufficient

lines.each do |line|
  line.chomp! # remove trailing nl
  puts "I read this line: #{line}."
end

You can as well do

File.foreach do |line|
  line.chomp! # remove trailing nl
  puts "I read this line: #{line}."
end

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/