Method: Lista#add_first

Defined in:
lib/pract/list.rb

#add_first(val) ⇒ Object

Add val as first element



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# File 'lib/pract/list.rb', line 39

def add_first (val)
  if (@head!= nil)
    point = @head
    point.prev = Nodo.new(nil, val, point)
    @head = point.prev
  else
    @head = @tail = Nodo.new(nil, val, nil)
  end
end