yardsGameRound.js

const probs = {
  0: {
    0: 0.7,
    1: 0.14,
    2: 0.1,
    3: 0.03,
    4: 0.02,
    5: 0.01
  },
  1: {
    0: 0.68,
    1: 0.14,
    2: 0.11,
    3: 0.04,
    4: 0.02,
    5: 0.01
  },
  2: {
    0: 0.64,
    1: 0.15,
    2: 0.12,
    3: 0.05,
    4: 0.03,
    5: 0.01
  },
  3: {
    0: 0.6,
    1: 0.15,
    2: 0.12,
    3: 0.06,
    4: 0.04,
    5: 0.02
  }
}

const makeAttempt = (spec) => {
  let sum = 0
  
  for (let prop in spec) {
    sum += spec[prop]
    if (Math.random() <= sum) {
      return prop
    }
  }
}


const getTeamYards = (teamPrestige, score, fullYards) => {
  const teamRound = makeAttempt(probs[teamPrestige])

  return {
    fullYArds: teamRound == 5 ? fullYards++ : fullYards,
    yards: score + parseInt(teamRound * 10)
  }
}


const game = (teamA, teamB) => {
  let yardsTeamA = 0
  let yardsTeamB = 0
  let fullYardsTeamA = 0
  let fullYardsTeamB = 0
  
  for (let i=0; i < 11; i++) {
    const teamAGetTeamYards = getTeamYards(teamA.prestige, yardsTeamA, fullYardsTeamA)
    const teamBGetTeamYards = getTeamYards(teamB.prestige, yardsTeamB, fullYardsTeamA)
    
    yardsTeamA = teamAGetTeamYards.yards
    fullYardsTeamA = teamAGetTeamYards.fullYArds
    
    yardsTeamB = teamBGetTeamYards.yards
    fullYardsTeamB = teamBGetTeamYards.fullYArds
  }
  
  const finalScoreTeamA = yardsTeamA + (fullYardsTeamA * 10)
  const finalScoreTeamB = yardsTeamB + (fullYardsTeamB * 10)
  
  return {
    teamA: finalScoreTeamA,
    teamB: finalScoreTeamB,
    displayResult: `${teamA.name} ${finalScoreTeamA} - ${finalScoreTeamB} ${teamB.name}`
  }
}

console.log(game({name: 'Madrid', prestige: 0}, {name: 'Dnipro', prestige: 1}))

console.log(game({name: 'New York', prestige: 0}, {name: 'Bangkok', prestige: 0}))

console.log(game({name: 'Valencia', prestige: 0}, {name: 'London', prestige: 0}))

console.log(game({name: 'Vancover', prestige: 0}, {name: 'Krakow', prestige: 0}))