04. Roli The Coder With Set

roliTheCoder = (input) => {
    let pattern = /(?<id>[\d]+)([ ]+)#(?<name>[^@]+)([ ]*)(?<participants>[@A-Za-z0-9'\- ]+)*/g;
    let events = {};
    for (let line of input) {
        if (line === 'Time for Code') {
            break;
        }
        if (line.match(pattern)) {
            let result = pattern.exec(line)
            let id = Number(result.groups.id);
            let name = result.groups.name.trim();
            let participants = [];
            if (result.groups.participants) {
                participants = [...new Set(result.groups.participants.split(' ').filter(el => el !== ''))];
            }
            if (!events[id]) {
                events[id] = { name, length: participants.length, participants }
            } else if (events[id].name === name) {
                let currentParticipants = events[id].participants;
                if (result.groups.participants) {
                    participants = [...new Set(result.groups.participants.split(' ').filter(el => el !== '').concat(currentParticipants))];
                    events[id] = { name, length: participants.length, participants }
                }
            }
        }
    }
    Object.entries(events)
        .sort((a, b) => b[1].length - a[1].length || a[1].name.localeCompare(b[1].name))
        .forEach(event => {
            console.log(`${event[1].name} - ${event[1].length}`)
            event[1].participants.sort((a, b) => a.localeCompare(b)).forEach(participant => console.log(`${participant}`));
        });
}