ecclesia/dist/election/tallying.js

Framework for political and electoral simulations

import { NumberCounter, DefaultMap } from "@gouvernathor/python/collections";
import { Scores } from "./tally";
export function tallySingleToSimple(ballots) {
    return NumberCounter.fromKeys(ballots);
}
export function tallyApprovalToSimple(ballots) {
    return NumberCounter.fromKeys(Array.from(ballots).flatMap(b => Array.from(b)));
}
export function tallyRankedToOrder(ballots) {
    return Array.from(ballots);
}
/**
 * This function assumes that the scores in each ballot are 0-based,
 * going from 0, inclusive, to nScores, exclusive.
 */
export function tallyScoreToScores(ballots, { nScores }) {
    const rawScores = new DefaultMap(() => Array(nScores).fill(0));
    for (const ballot of ballots) {
        for (const [candidate, scoreBasedOn0] of ballot.entries()) {
            rawScores.get(candidate)[scoreBasedOn0] += 1;
        }
    }
    return Scores.fromEntries(Array.from(rawScores.entries()));
}
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