Middleware method that will chain and optionally run other middlewares given a condition

DynamicExpressMiddlewares.js

const express = require('express');
const app = express();

const dynamicMiddlewareAddition = async (req, res, next) => {
  const number = Math.round(Math.random() * 100);
  const isEven = number % 2 === 0;
  //given a condition, run certain middlewares chained to one another.
  const middlewares = isEven ? [middleware2] : [middleware1, middleware2, middleware3];
  console.log(number, isEven, middlewares);
  if(middlewares.length >= 1) {
    const combinedMiddleware = (index) => {
      if(index === middlewares.length) {
        return next();
      }
      const middleware = middlewares[index];
      middleware(req, res, () => combinedMiddleware(index + 1));
    }
    return combinedMiddleware(0);
  }
  return next();

};

const middleware1 = (req, res, next) => {
  console.log("Middleware 1");
  return next();
}

const middleware2 = (req, res, next) => {
  console.log("Middleware 2");
  return next();
}

const middleware3 = (req, res, next) => {
  console.log("Middleware 3");
  return next();
}

app.use(dynamicMiddlewareAddition);

app.listen(1000, () => {
  console.log("listening! Go to localhost:1000 and see the middlewares log differently if the generated number is even or not.");
})