Question

I have a text file and I am trying to replace certain lines with the values in a hash. I am trying to make it loop through the file, and swap out anything that matches the hash. For some reason this isn’t working, it only duplicates the file, doesn’t swap anything out. Any Ideas?

HASHBROWNS{

'mustard'  =>  'dijon',
'ketchup'  =>  'catsup',

}


File.open('new_hashed_file.txt', 'w') do |file|
  File.open('oldfile.txt', 'r').readlines.each do |swaparoo|
       if HASHBROWNS.has_key?(swaparoo.downcase)
             file.puts HASHBROWNS[swaparoo.downcase]
       else
             file.puts swaparoo
       end
  end
end

Thanks

Ryn

Answer 1

Change this line:

File.open('oldfile.txt', 'r').readlines.each do |swaparoo|

to this:

File.open('oldfile.txt', 'r').readlines.map(&:chomp).each do |swaparoo|

The problem is your array of lines contains newlines.