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# frozen_string_literal: true
#
# 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]
raise(Puppet::ParseError, 'difference(): Requires 2 arrays') unless first.is_a?(Array) && second.is_a?(Array)
result = first - second
return result
end
end
# vim: set ts=2 sw=2 et :
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