rc-js-util/bin/esm/map/impl/map-reporting-add-to-set.js

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

export function mapReportingAddToSet(map, key, value) {
    const values = map.get(key);
    if (values != null) {
        if (values.has(value)) {
            return false;
        }
        else {
            values.add(value);
            return true;
        }
    }
    else {
        const set = new Set();
        set.add(value);
        map.set(key, set);
        return true;
    }
}
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