spellweaver

export class FreqCounter {
    _total = 0;
    _counters = new Map();
    get total() {
        return this._total;
    }
    get counters() {
        return this._counters;
    }
    getCount(key) {
        return this._counters.get(key);
    }
    getFreq(key) {
        return (this.getCount(key) || 0) / (this._total || 1);
    }
    addKeyCount(key, count) {
        this._total += count;
        this._counters.set(key, (this._counters.get(key) || 0) + count);
        return this;
    }
    addKey(key) {
        return this.addKeyCount(key, 1);
    }
    addKeys(keys) {
        for (const key of keys) {
            this.addKey(key);
        }
    }
    addKeyCounts(values) {
        for (const pair of values) {
            this.addKeyCount(pair[0], pair[1]);
        }
    }
    merge(...freqCounters) {
        for (const fc of freqCounters) {
            this.addKeyCounts(fc._counters);
        }
        return this;
    }
    static create(values) {
        const fc = new FreqCounter();
        fc.addKeys(values || []);
        return fc;
    }
}
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