Kata

Define a method sum_eq_n? which takes an array of integers and an additional integer, n, as arguments and returns true if any two elements in the array of integers sum to n. An empty array should sum to zero by definition.

Examples:

sum_eq_n?([1, 2, 3, 4], 6) == true  # 4 + 2 = 6
sum_eq_n?([1, 2, 3, 4], 8) == false # Not possible
sum_eq_n?([], 0) == true # An empty array should sum to 0
sum_eq_n?([], 1) == false # Not possible

I saw this on stackoverflow and thought it would make an interesting kata.