From: "Kroeger, Simon (ext)" <simon.kroeger.ext@...>
Date: 2005-12-08T19:47:05+09:00
Subject: Re: increasing counter whithin loop?


> > able to use it. I'd probably have to create each_with_prev_and_next.

It's allready there:

-----------------------------------------------------------------
require 'enumerator'
a=[:a, :b, :b, :c, :b, :d, :e, :e]

([nil] + a + [nil]).each_cons(3) do |prv, this, nxt|
  next if prv == this
  print 'double_' if this == nxt
  puts this
end
-----------------------------------------------------------------
output:
  a
  double_b
  c
  b
  d
  double_e

cheers

Simon