Среднее арифметическое узлов графа

const curry = reducer => {
    const walk = graph => {
        const { children } = graph;
        return children
            ? children.map(walk).reduce(reducer, { ...graph, count: 1 })
            : { ...graph, count: 1 };
    };
    return walk;
};
const average = graph => {
    const { value, count } = curry((acc, cur) => {
        return {
            value: acc.value + cur.value,
            count: acc.count + cur.count
        };
    })(graph);
    return value / count;
};