LC 30 days challenge - DAY2

happy_number.rb

# https://leetcode.com/problems/happy-number/
def is_happy(n)
    repeats = []
    loop do
        n = n.to_s.split('').inject(0) { |sum,x| sum + x.to_i*x.to_i  }
        return true if n == 1
        return false if repeats.include?(n)

        repeats << n
    end
end

p is_happy(19)