Ruby: Is there something like Enumerable#drop that returns an enumerator instead of an array?

enumerable, ruby

Solution

If you need it more than once, you could write an extension to `Enumerator`.

class Enumerator
  def enum_drop(n)
    with_index do |val, idx|
      next if n == idx
      yield val
    end
  end
end

File.open(testfile).each_line.enum_drop(1) do |line|
  print line
end

# prints lines #1, #3, #4, …

Problem

I have some big fixed-width files and I need to drop the header line. Keeping track of an iterator doesn't seem very idiomatic. ``` # This is what I do now. File.open(filename).each_line.with_index do |line, idx| if idx > 0 ... end end # This is what I want to do but I don't need drop(1) to slurp # the file into an array. File.open(filename).drop(1).each_line do { |line| ... } ``` What's the Ruby idiom for this?

Original source