Lottery Classes

Pactole.js exposes lottery-handling classes in pactole-js:

• BaseLottery: Generic implementation for draw-day handling and combination creation.
• EuroMillions: Preconfigured lottery (Tuesday, Friday) using EuroMillionsCombination.
• EuroDreams: Preconfigured lottery (Monday, Thursday) using EuroDreamsCombination.

Create a lottery instance

Use built-in classes when your game rules match EuroMillions or EuroDreams.

import { EuroDreams, EuroMillions } from 'pactole-js';

const euromillions = new EuroMillions();
const eurodreams = new EuroDreams();

console.log(euromillions.drawDays.days);
console.log(eurodreams.drawDays.days);

Get last and next draw dates

Lottery instances delegate date computations to configured draw days.

import { EuroMillions } from 'pactole-js';

const lottery = new EuroMillions();

console.log(lottery.getLastDrawDate(new Date(2026, 1, 19), true));
console.log(lottery.getNextDrawDate(new Date(2026, 1, 19), true));

Create and generate combinations from a lottery

Use the same API through the lottery class instead of calling combination classes directly.

import { EuroMillions } from 'pactole-js';

const lottery = new EuroMillions();

const played = lottery.getCombination({ numbers: [3, 15, 22, 28, 44], stars: [2, 9] });
const randomTickets = lottery.generate({ n: 3 });

console.log(played);
console.log(randomTickets);

Build your own lottery class

Subclass BaseLottery to define custom draw days and your own combination class.

import { BaseLottery, EuroMillionsCombination, Weekday } from 'pactole-js';

class CustomLottery extends BaseLottery {
    constructor() {
        super({
            drawDays: [Weekday.MONDAY, Weekday.THURSDAY],
            combinationFactory: EuroMillionsCombination
        });
    }
}

const custom = new CustomLottery();
console.log(custom.drawDays.days);