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module RDF::N3::Algebra::Math
##
# The subject is a list of numbers. The object is calculated as the arithmentic product of those numbers.
#
# @see https://www.w3.org/TR/xpath-functions/#func-numeric-multiply
class Product < RDF::N3::Algebra::ListOperator
NAME = :mathProduct
URI = RDF::N3::Math.product
##
# The math:product operator takes a list of strings or numbers and calculates their sum.
#
# @param [RDF::N3::List] list
# @return [RDF::Term]
# @see RDF::N3::ListOperator#evaluate
def resolve(list)
list.to_a.map(&:as_number).reduce(&:*) || RDF::Literal(1) # Empty list product is 1
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems