Question

I have the below code snippet:

   line_sub = Regexp.new(/\s+|"|\[|\]/)
   tmp = Array.new
    # reading a file
   while line = file.gets
     ... 
     tmp[0],tmp[1] = line.to_s.scan(/^.*$/).to_s.split('=')
    #remove unwanted characters
     tmp.collect! do |val|
       val.gsub(line_sub, "")
     end
    ...
   end

but when I run the code I get the error:

 undefined method `gsub' for nil:NilClass (NoMethodError)

something seems to be wrong here:

tmp.collect! do |val|
 val.gsub(line_sub, "")
end

Any idea?

Answer 1

try this way for your solution

tmp.collect! do |val|
  if val.present?   # or unless val.nil?
    val.gsub(line_sub, "")
  end
end