[REBOL] Re: cycling

From: jeff::rebol::net at: 6-Jul-2001 6:12

> Given a set of M "index" values, what's the simplest way to
> cycle through them, both forward and backward?

A set of M 'index' values
 -- you mean a block?

  b: copy [1 2 3 ... m]

  ;-- or b: copy [0 1 2 3 ... (m - 1)]

  forever [
      forall b [print index? b]
      until [print index? b head? b: back b]
  ]

  -jeff

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