Check out my 1 line ternary!

Leaderboard

data = [
  {
    home_team: "Patriots",
    away_team: "Broncos",
    home_score: 7,
    away_score: 3
  },
  {
    home_team: "Broncos",
    away_team: "Colts",
    home_score: 3,
    away_score: 0
  },
  {
    home_team: "Patriots",
    away_team: "Colts",
    home_score: 11,
    away_score: 7
  },
  {
    home_team: "Steelers",
    away_team: "Patriots",
    home_score: 7,
    away_score: 21
  }
]


def winloss(winner, loser, leaderboard)
  winner_record = leaderboard[winner] || { wins: 0, losses: 0 }
  winner_record[:wins] += 1
  loser_record = leaderboard[loser] || { wins: 0, losses: 0 }
  loser_record[:losses] += 1
  leaderboard[winner] = winner_record
  leaderboard[loser] = loser_record
end

leaderboard = {} 

data.each do |game|
  game[:home_score] > game[:away_score] ? winloss(game[:home_team], game[:away_team], leaderboard) : winloss(game[:away_team], game[:home_team], leaderboard)
end


leaderboard.each.with_index(1) do |(name, winlosshash), i|
  puts "#{i}. #{name} #{winlosshash[:wins]} wins, #{winlosshash[:losses]} losses"
end