scrabble.rb

# mostly taken from this stack overflow post: https://stackoverflow.com/a/39212997
class Array
    def difference(other)
        h = other.each_with_object(Hash.new(0)) { |e,h| h[e] += 1 }
        reject { |e| h[e] > 0 && h[e] -= 1 }
    end
end 

def scrabble(letters)
    f = File.open('/usr/share/dict/words')
    words = f.read.downcase.split("\n").uniq

    longest = ''

    words.each do |word|
        if word.length <= letters.length && word.chars.difference(letters.chars).empty? && word.length > longest.length
            longest = word
        end
    end

    longest
end