get-players.js

function getPlayers () {
  var players = [
    { name: 'Alice', score: 99 },
    { name: 'Billy', score: 83 },
    { name: 'Cindy', score: 91 },
    { name: 'David', score: 96 },
    { name: 'Emily', score: 88 }
  ]

  function randomIndex () {
    return Math.floor(Math.random() * players.length)
  }

  var playerNum = 1
  setInterval(function () {
    players.forEach(function (player) {
      player.score += Math.random() * 10
    })
    if (players.length > 3 && Math.random() < 0.05) {
      players.splice(randomIndex(), 1)
    }
    if (Math.random() < 0.05) {
      players.splice(randomIndex(), 0, { 
        name: 'Player ' + playerNum++, 
        score: players[randomIndex()].score 
      })
    }
  }, 200)
  
  return players
}