sum_even_odd.rb

def get_sum(n)
  odd, even = 0, 0
  (1..n).map{|i| i % 2 == 0 ? even += i : odd += i  }
  puts "Suma de Pares : #{even} \nSuma de Impares : #{odd}"
end

sum_even_odd_other_version.rb

def get_sum(n) 
  puts "Suma de Pares : #{(0..n).step(2).reduce(:+)}"
  puts "Suma de Impares : #{(1..n).step(2).reduce(:+)}"
end