A Ruby solution for Google's Interview question: Check if any 2 numbers of an array add up to 8 (https://www.youtube.com/watch?v=XKu_SEDAykw)

check_array_for_sum.rb

def check_array_for_sum?(array, sum)
  !!array.combination(2).detect { |a, b| a + b == sum }
end

sum = 8

array = [1, 2, 4, 9]
check_array_for_sum?(array, sum) # returns false

array = [1, 2, 4, 4]
check_array_for_sum?(array, sum) # returns true

array = [1, 2, 3, 6]
check_array_for_sum?(array, sum) # returns true