Roll the dice | simple code that can parse standard dice notation (e.g. '2d20+3') and return a more or less random result within that range

dice.js

"use strict";

const dice = {

	validate: (diceNotation) => {
		const match = /^(\d+)?d(\d+)([+-]\d+)?$/.exec(diceNotation);
		if (!match) {
			throw "Invalid dice notation: " + diceNotation;
		} else {
			return match;
		}
	},

	diceData: (diceNotation) => {
		const match = dice.validate(diceNotation);
		if (match) {
			const diceInfo = {
				"numberOfDice": typeof match[1] === "undefined" ? 1 : parseInt(match[1]),
				"sidesOfDice": parseInt(match[2]),
				"diceModifier": typeof match[3] === "undefined" ? 0 : parseInt(match[3])
			};
			return diceInfo;
		}
	},

	math: (diceData) => {
		let total = 0;
		for (let i = 0; i < diceData.numberOfDice; i++) {
			total += Math.floor(Math.random() * diceData.sidesOfDice) + 1;
		}
		total += diceData.diceModifier;
		return total;
	},

	roll: (humanInput) => {
		return dice.math(dice.diceData(humanInput));
	}
};