puppetlabs-stdlib/lib/puppet/parser/functions/is_hash.rb

#
# is_hash.rb
#

module Puppet::Parser::Functions
  newfunction(:is_hash, :type => :rvalue, :doc => <<-EOS
Returns true if the variable passed to this function is a hash.
    EOS
  ) do |arguments|

    raise(Puppet::ParseError, "is_hash(): Wrong number of arguments " +
      "given (#{arguments.size} for 1)") if arguments.size != 1

    type = arguments[0]

    result = type.is_a?(Hash)

    return result
  end
end

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