Avg_Std_Med.js

gistfile1.txt

var config = {};

var stateVars = {
  roundResults: [],
  historyLoaded: false,
};

if (engine.gameState === "GAME_STARTING") {
  log("starting script...");

}

engine.on("GAME_STARTING", onGameStarted);
engine.on("GAME_ENDED", onGameEnded);

function onGameStarted() {
  if (!stateVars.historyLoaded)
  {
    log("Loading history...");
    loadHistory();
    stateVars.historyLoaded = true;
  }
}

function onGameEnded() 
{
  if (!stateVars.historyLoaded)
  {
    return;
  }
  var lastGame = engine.history.first();
  stateVars.roundResults.push(lastGame.bust);

  if (stateVars.roundResults.length > 50) {
    var throwAway = stateVars.roundResults.shift();

    log("Throwing away last value ", throwAway);
  }

  var avg = calculateAverage();
  var std = calculateStandardDeviation();
  var med = calculateMedian();

  log("AVERAGE = ", avg, "OVER", stateVars.roundResults.length, "GAMES");
  log("STANDARD DEV = " + std);
  log("DIFF = " + (avg - std));
  log("MEDIAN = " + med);
}

function loadHistory() {
  var history = engine.history.toArray().reverse();

  for (var i = 0; i < history.length; i++) {
    var game = history[i];
    stateVars.roundResults.push(game.bust);
  }
}

// Helper functions
function calculateStandardDeviation() {
  var array = stateVars.roundResults;
  const n = array.length
  const mean = array.reduce((a, b) => a + b) / n
  return Math.sqrt(array.map(x => Math.pow(x - mean, 2)).reduce((a, b) => a + b) / n)
}

function calculateMedian() {
  var array = stateVars.roundResults.slice();
  if (array.length === 0) return 0;

  array.sort(function(a, b) {
    return a - b;
  });

  var half = Math.floor(array.length / 2);

  if (array.length % 2)
    return array[half];

  return (array[half - 1] + array[half]) / 2.0;
}

function calculateAverage() {
  var runningTotal = 0;

  if (stateVars.roundResults.length == 0) {
    return 0;
  }

  for (var i = 0; i < stateVars.roundResults.length; i++) {
    runningTotal += stateVars.roundResults[i];
  }

  return runningTotal / stateVars.roundResults.length;
}