arrays - Collect all not in using Ruby -

I have been truncated this small code.

I do not know Ruby and I think it's a great opportunity to implement it.

I want to print all the rows in the file e , which are not in the file c . Each row is a number.

This is what I have:

  e = file. New ('E') Readlines c = File.new ('C'). Readline x = E. Collect. Items | C.include? (item)? The problem is that both files can have spaces, and for this reason the same number can not be treated like this. (Like "1234" is different from "1234")  
 How do I need my code to fix this? I have tried  c.include? (Item.strip)  .. but it does not seem to work. 
 
 
 
 
 
 You are  tab  when you  readlines  will help, i.e. 
 
  e = file. Roline ('e'). Map {| X | X.strip} c = File.readlines ('c'). Map {| X | X.strip}  
 
 If you do not want an empty string, you can use  archive , or perhaps  select : 
   x = e.select {| I | ! C.include? (I)}  

edit : Or, as suggested,

  x = ec