decide.nolog.cz/app/components/poll-evaluation-participants-table.js

import Component from '@glimmer/component';
import { DateTime } from 'luxon';

export default class PollEvaluationParticipantsTable extends Component {
  get optionsPerDay() {
    const { poll } = this.args;

    const optionsPerDay = new Map();
    for (const option of poll.options.toArray()) {
      optionsPerDay.set(
        option.day,
        optionsPerDay.has(option.day) ? optionsPerDay.get(option.day) + 1 : 0
      );
    }

    return new Map(
      Array.from(optionsPerDay.entries()).map(([dayString, count]) => [
        DateTime.fromISO(dayString).toJSDate(),
        count,
      ])
    );
  }

  get usersSorted() {
    const { poll } = this.args;
    return poll.users
      .toArray()
      .sort((a, b) => (a.creationDate > b.creationDate ? 1 : -1));
  }
}