Google Slides Fudge Dice

GoogleSlidesFudgeDice.gs

function onOpen() {
  SlidesApp.getUi()
    .createMenu("Dice")
    .addItem("Roll 4df", "runFudgeDice")
    .addToUi();
  update();
}

function runFudgeDice() {
  const fudgeDice = [-1, -1, 0, 0, 1, 1];
  const result = rollDice(fudgeDice, 4);
  const ui = SlidesApp.getUi();
  const title = "You rolled a " + result.toString();
  ui.alert(title, "", ui.ButtonSet.OK);
}

function rollDice(dice, times) {
  let total = 0;
  for (let i = 0; i < times; i++) {
    const side = getRandomDiceSide(dice.length);
    const roll = dice[side];
    total += roll;
  }

  return total;
}

function getRandomDiceSide(numberOfSides) {
  const randomNumber = Math.round(Math.random() * 100);
  const side = randomNumber % numberOfSides;
  return side;
}