From: Brian Candler <b.candler@...>
Date: 2011-04-21T00:25:39+09:00
Subject: Re: Can I check contain value in hash?

Robert K. wrote in post #993961:
> My first choice would be to use Set and not Hash as values.

OK, although Set is really just a thin wrapper around Hash(*), and I 
find it easier to work with objects of one class instead of a two.

Regards,

Brian.

(*) example methods from class Set:

  def size
    @hash.size
  end

  def empty?
    @hash.empty?
  end

  def clear
    @hash.clear
    self
  end

  def to_a
    @hash.keys
  end

  def include?(o)
    @hash.include?(o)
  end

  def add(o)
    @hash[o] = true
    self
  end

  def delete(o)
    @hash.delete(o)
    self
  end

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