Build an application from middleware passed in variadically

middleware.js

const connectMiddleware = (...middleware) => (req, res) => {
    const doAt = (i) => () => {
        if (i === middleware.length) throw new Error ("MockError: out of middleware!");
        middleware[i](req, res, doAt(i+1));
    };
    doAt(0)();
}

module.exports = connectMiddleware;