Ruby solution for CFML Slack Friday Puzzle

ranks.rb

require 'open-uri'
require 'json'
data = JSON.load(open("https://gist.githubusercontent.com/ryanguill/036a35ad8cc07bf600b25212eacc3ced/raw/4c5f67ecc4993c09f5776c8b0144020beda798e6/karma.json"))

counts_by_user = data.each_with_object(Hash.new(0)){|k,counts| counts[k['user']] += 1 }

users_by_score = counts_by_user.group_by{|k,v| v }

top_scores = users_by_score.keys.sort.reverse.first(10)

top_scores.each_with_index do |k, place|
  puts "[ ##{place + 1} @ #{k}k ]: #{users_by_score[k].map{|u| u[0] }.join(', ')}"
end