From: Sean O'Halpin <sean.ohalpin@...>
Date: 2007-10-26T09:23:19+09:00
Subject: Re: Skip the first invocation e.g. skip_first { foo }

------=_Part_2829_829289.1193358200322
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

On 10/26/07, Brian Adkins <lojicdotcom@gmail.com> wrote:
>
> What I'm trying to accomplish is a convenient way to execute a block
> of code on every iteration except the first (or only on the first
> iteration).
>

I haven't figured out a way to avoid initializing outside the loop, but is
this the kind of functionality you're after?

def skipn(n)
  x = -1
  proc {|block|
    if (x += 1) == n
      block.call
      true
    else
      false
    end
    }
end

skip = skipn(1) # or 0 or 2 or ...
('a'..'d').each do |i|
  next if skip[ proc { puts "Hi" } ]
  puts i
end

skip = skipn(1)
('a'..'d').each do |i|
  break if skip[ proc { puts "Hi" } ]
  puts i
end

__END__
a
Hi
c
d
a
Hi

Regards,
Sean

------=_Part_2829_829289.1193358200322--