From: Roger Lipscombe <rlipscombe@...>
Date: 2001-08-23T18:46:54+09:00
Subject: [ruby-talk:20172] Recursively passing blocks...

I was attempting to implement a recursive directory walker (before someone
pointed me at Find.find), but this question remains...

class Dir
  def Dir.walk(path, &block)
    # ...stuff
    if something
      walk(child, block)
    else
      block.call(child)
    end
  end
end

Dir.walk(".") { |f| puts f }

If I pass two arguments to walk, I get an error, because it's only expecting
one.
If I pass only one argument to walk, I get an error when trying to call the
block, because it's nil.

So, what's the correct way to pass a block to a recursive algorithm?

Cheers,
Roger.