Method: Immutable::Consable#zip_with

Defined in:
lib/immutable/consable.rb

#zip_with(*xss, &block) ⇒ Consable

Takes zero or more Consable objects and returns the Consable object obtained by applying the given block to an array of the corresponding elements of self and the input Consable objects. xs.zip_with(*yss, &block) is equivalent to xs.zip(*yss).map(&block).



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# File 'lib/immutable/consable.rb', line 303

def zip_with(*xss, &block)
  if empty?
    empty
  else
    heads = xss.map { |xs| xs.null? ? nil : xs.head }
    tails = xss.map { |xs| xs.null? ? empty : xs.tail }
    Cons(yield(head, *heads), tail.zip_with(*tails, &block))
  end
end