Heuristic function to calculate the "value" of a prediction against a given score

scoring.js

// Heuristic function to calculate the "value" of a prediction against a given score
// basically it measures the distance of the prediction to the given score as an integer number
// a negative scoring means that a match with this prediction is already impossible

function scoring(score, prediction) {
  res = 0;

  // calculates the diatance of prediction for the house result
  house_distance = prediction.house - score.house;

  if(house_distance > 0)
        res += Math.abs(house_distance);
  else
        res -= Math.abs(house_distance);

  // calculates the distance of prediction for the away result
  away_distance = prediction.away - score.away;

  if(away_distance > 0)
    res += Math.abs(away_distance);
  else
    res -= Math.abs(away_distance);

  return res;
}

// a series of score to test

scores = [
	{ house:0, away:0 },
	{ house:1, away:0 },
	{ house:1, away:1 },
	{ house:2, away:1}
];

// the predictions to evaluate

predictions = [
    { house:0, away:0 },
    { house:1, away:0 },
    { house:1, away:1 },
    { house:2, away:1 }
];

// iterate through the scores and evaluate each prediction

for(s=0; s < scores.length; s++) {
	console.log("******************************************");
	console.log ("CALCULATING HEURISTICS FOR SCORE: " + scores[s].house + "-" + scores[s].away);

	user_winner = null;
	winner_scoring = null;

	// iterate through the predictions
	for(i=0; i < predictions.length; i++) {		
		user = i + 1;

		// calculate this prediction scoring
		prediction_scoring = scoring(scores[s], predictions[i]);

		console.log("   prediction of user U" + user + " " + predictions[i].house + "-" + predictions[i].away + " got scoring of " + prediction_scoring);

		if(prediction_scoring >= 0) {
			// prediction is an exact match or at least is still possible
			if(user_winner == null || prediction_scoring < winner_scoring) {
				// first evaluation or current prediction is better than the current winner
				user_winner = i;
        	    winner_scoring = prediction_scoring;
			}
        }
	}

	// shows the current winner
	console.log("CURRENT WINNER FOR THIS SCORE IS U" + (user_winner + 1));	
}