highest-averages/dist/highest_average.js

Zero-dependency and extensible set of highest averages methods for allocating seats in a parliament. ### Install ```shell npm i highest-averages ``` ### Pure Example - Define the candidates with their vote ```typescript const a = new Candidate('A', 200) c

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.HighestAverage = void 0;
const candidate_result_1 = require("./models/candidate_result");
require("./extensions/array_extensions");
class HighestAverage {
    divisor;
    candidates = [];
    seat = 0;
    constructor(divisor) {
        this.divisor = divisor;
    }
    withSeat(seat) {
        this.seat = seat;
        return this;
    }
    withCandidates(candidates) {
        this.candidates.clear();
        candidates.forEach(candidate => this.candidates.push(candidate));
        return this;
    }
    apply() {
        const totalVote = this.candidates.sumOf(candidate => candidate.vote);
        const candidateResults = this.candidates.map(candidate => new candidate_result_1.CandidateResult(candidate, totalVote));
        const dividedVote = (candidateResult) => candidateResult.candidate.vote / this.divisor.next(candidateResult.seat);
        let selected = 0;
        while (this.seat !== selected) {
            const selectableCandidates = candidateResults
                .filter(candidateResult => candidateResult.selectable());
            if (selectableCandidates.length > 1) {
                selectableCandidates
                    .reduce((x, y) => dividedVote(x) > dividedVote(y) ? x : y)
                    .select();
                selected++;
            }
            else if (selectableCandidates.length === 1) {
                selectableCandidates[0].select();
                selected++;
            }
            else {
                break;
            }
        }
        return candidateResults;
    }
}
exports.HighestAverage = HighestAverage;