markup/mediawiki/sample.mediawiki [92:98]:
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  def fold_left(&accumulator)
    # yield left to right (head to tail)
  end

  def fold_right(&accumulator)
    # yield right to left (tail to head)
  end
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markup/mediawiki/sample.mediawiki [110:116]:
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  def fold_left(&accumulator)
    # yield left to right (head to tail)
  end

  def fold_right(&accumulator)
    # yield right to left (tail to head)
  end
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