Round robin, league matches schedule on javascript

robin.js

let teams = [
  'Tigers',
  'Foofels',
  'Drampamdom',
  'Lakebaka'
]

const roundRobin = (teams) => {
  let schedule = []
  let league = teams.slice()
  
  if (league.length % 2) {
    league.push('None')
  }
  
  let rounds = league.length
  
  for (let j=0; j<(rounds-1)*2; j ++) {
    schedule[j] = []
    for (let i=0; i<rounds/2; i++) {
      if (league[i] !== 'None' && league[rounds-1-i] !== 'None') {
        if (j % 2 == 1) {
          schedule[j].push([league[i], league[rounds-1-i]])
        } else {
          schedule[j].push([league[rounds-1-i], league[i]])
        }
      }
    }
    league.splice(1, 0, league.pop())
  }
  return schedule
}

let leagueSchedule = roundRobin(teams)

for (let p=0; p<leagueSchedule.length; p++) {
  console.log(leagueSchedule[p])
}

TypeScript version: https://gist.github.com/skinnyfads/b12a1f3d4d578a2374324fd6a5750a45