Node betting game

game.js

var color = require('colors');
var fs = require('fs');
var player1 = {
  cash: 50,
  wins: 0
};
var player2 = {
  cash: 50,
  wins: 0
};
var players = [player1, player2];
var playerInput = require('./module');
var current_player = player1; 

function startRound() {
  player = current_player;
  var number = Math.floor(Math.random() + 1); 

  if ((player.cash - player.bet) >= 0) {
    evaluteGuess(player, number);
  } else {
    console.log(color.red(player.name + ", you don't have enough money!"));
  }
}

function endRound() {
  if (current_player === player1) {
    current_player = player2;
    startRound();
  } else {
    current_player = player1;
    fs.readFile('leaderboard.txt', function(err, res) {
      if (err) {
        console.log(err);
      } else {
        console.log(res.toString());
        playerInput(players, startRound);
      }
    });
  }
}

function evaluteGuess(player, number) {
  if (correctGuess(player.guess, number)) {
    player.wins += 1;
    updateLeaderboard(number);
  } else if (closeGuess(player.guess, number)) {
    console.log(color.yellow("You're close!"));
    displayResult(player, number, false);
  } else {
    displayResult(player, number, false);
  }
}

function correctGuess(guess, actual) {
  if (guess == actual) {
    return true;
  } else {
    return false;
  }
}

function closeGuess(guess, actual) {
  if ((guess - 1) == actual || (guess + 1) == actual) {
    return true;
  } else {
    return false;
  }
}

function displayResult(player, number, correct) {
  if (correct) {
    console.log(color.green(player.name + ", you're right!"));
    player.cash += parseInt(player.bet);
  } else {
    console.log(color.red(player.name + ", you're wrong!"));
    player.cash -= player.bet;
  }
  console.log("The number was " + number);
  console.log(player.name + ", you have " + player.cash);
  endRound();
}

function updateLeaderboard(number) {
  var data = "Player 1 has " + players[0].wins + ".\n";
  data += "Player 2 has " + players[1].wins + ".";
  fs.writeFile('leaderboard.txt', data, function(err) {
    if (err) return console.log(err);
    console.log("Written!");
    displayResult(player, number, true);
  });
}
playerInput(players, startRound);

module.js

var prompt = require('prompt-sync')();

module.exports = function getInput(players, callback) {
  for (var i = 0; i < players.length; i++) {
    if (players[i].name === undefined){
      players[i].number = (i + 1);
      players[i].name = prompt("Player " + players[i].number + ", what's your name?");
    }
    players[i].bet = prompt(players[i].name + ", name your bet!");
    players[i].guess = prompt(players[i].name + ", guess a number!");
  }

  callback(players);
};