difference.rb
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difference.rb
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	#
	# difference.rb
	#
	module Puppet::Parser::Functions
	newfunction(:difference, :type => :rvalue, :doc => <<-DOC
	@summary
	This function returns the difference between two arrays.

	The returned array is a copy of the original array, removing any items that
	also appear in the second array.

	@example Example usage

	difference(["a","b","c"],["b","c","d"])
	Would return: `["a"]`

	> Note:
	Since Puppet 4 the minus (-) operator in the Puppet language does the same thing:
	['a', 'b', 'c'] - ['b', 'c', 'd']
	Would return: `['a']`

	@return [Array]
	The difference between the two given arrays

	DOC
	) do \|arguments\|

	# Two arguments are required
	raise(Puppet::ParseError, "difference(): Wrong number of arguments given (#{arguments.size} for 2)") if arguments.size != 2

	first = arguments[0]
	second = arguments[1]

	unless first.is_a?(Array) && second.is_a?(Array)
	raise(Puppet::ParseError, 'difference(): Requires 2 arrays')
	end

	result = first - second

	return result
	end
	end

	# vim: set ts=2 sw=2 et :