getMapPaths.js

    static getMapPaths(map) {
        map = new Map(map);
        getPaths = (map, result = new List([])) => {
            if (!Map.isMap(map)) {
                return result;
            }
            return map.flip().toList().reduce((res, k) => {
                return res.push(getPaths((map.get(k)), result.push(k)));
            }, new List());
        };
        return getPaths(map).flatten(1);
    }
    
    static getMapPaths(map) {
        map = new Map(map);
        getPaths = (map, result = new List([])) => (
            !Map.isMap(map) && result ||
            map.flip().toList().reduce(
                (res, k) => res.push(getPaths((map.get(k)), result.push(k))),
                new List()));
        return getPaths(map).flatten(1);
    }