Module: Immutable::Foldable

Included in:
List, Map, Stream
Defined in:
lib/immutable/foldable.rb

Instance Method Summary collapse

Instance Method Details

#length ⇒ Integer Also known as: size

Returns the number of elements in self. May be zero.

Returns:

  • (Integer) —

    the number of elements in self.



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# File 'lib/immutable/foldable.rb', line 6

def length
  foldl(0) { |x, y| x + 1 }
end

#product ⇒ #*

Computes the product of the numbers in self.

Returns:

  • (#*) —

    the product of the numbers.



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# File 'lib/immutable/foldable.rb', line 25

def product
  foldl(1, &:*)
end

#sum ⇒ #+

Computes the sum of the numbers in self.

Returns:

  • (#+) —

    the sum of the numbers.



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# File 'lib/immutable/foldable.rb', line 18

def sum
  foldl(0, &:+)
end