class HashWithIndifferentAccess

# File lib/hobo_support/hash.rb, line 89
def &(keys)
  res = HashWithIndifferentAccess.new
  keys.each do |k|
    k = k.to_s if k.is_a?(Symbol)
    res[k] = self[k] if has_key?(k)
  end
  res
end

# File lib/hobo_support/hash.rb, line 82
def -(keys)
  res = HashWithIndifferentAccess.new
  keys = keys.map {|k| k.is_a?(Symbol) ? k.to_s : k }
  each_pair { |k, v| res[k] = v unless k.in?(keys) }
  res
end

# File lib/hobo_support/hash.rb, line 98
def partition_hash(keys=nil)
  keys = keys._?.map {|k| k.is_a?(Symbol) ? k.to_s : k }
  yes = HashWithIndifferentAccess.new
  no = HashWithIndifferentAccess.new
  each do |k,v|
    if block_given? ? yield(k,v) : keys.include?(k)
      yes[k] = v
    else
      no[k] = v
    end
  end
  [yes, no]
end