Class: RDF::N3::Algebra::Math::Product

Inherits:

ListOperator

• Object
• SPARQL::Algebra::Operator::Binary
• ListOperator
• RDF::N3::Algebra::Math::Product

Defined in:

lib/rdf/n3/algebra/math/product.rb

Overview

The subject is a list of numbers. The object is calculated as the arithmentic product of those numbers.

See Also:

• https://www.w3.org/TR/xpath-functions/#func-numeric-multiply

Constant Summary

NAME =

:mathProduct

URI =

RDF::N3::Math.product

Instance Attribute Summary

Attributes included from Enumerable

#existentials, #universals

Instance Method Summary

• #resolve(list) ⇒ RDF::Term

  The math:product operator takes a list of strings or numbers and calculates their sum.

Methods inherited from ListOperator

#as_literal, #execute, #input_operand, #validate

Methods included from Builtin

#each, #evaluate, #hash, #input_operand, #rank, #to_uri

Instance Method Details

#resolve(list) ⇒ RDF::Term

The math:product operator takes a list of strings or numbers and calculates their sum.

Parameters:

• list (RDF::N3::List)

Returns:

• (RDF::Term)

See Also:

• ListOperator#evaluate

# File 'lib/rdf/n3/algebra/math/product.rb', line 16

def resolve(list)
  list.to_a.map(&:as_number).reduce(&:*) || RDF::Literal(1)  # Empty list product is 1
end