Using Higher order function to filter something out

index.js

const express = require('express')
const resorts = require('./resort-names.json')
const { port = 3333, delay = 0 } = require('minimist')(process.argv)
const cors = require('cors')

const byName = name => resort =>
  name.toLowerCase() === resort.substr(0, name.length).toLowerCase()

const logger = (req, res, next) => {
  console.log(`${req.method} request for ${req.url}`)
  next()
}

const app = express()
  .use(logger)
  .use(cors())
  .use('/', express.static('./dist/img'))
  .get('/resorts', (req, res) => res.status(200).json(resorts))
  .get('/resorts/:name', (req, res) =>
    setTimeout(
      () => res.status(200).json(resorts.filter(byName(req.params.name))),
      delay,
    ),
  )

app.listen(port, () =>
  console.log(
    'Ski resort app running on port ' +
      port +
      ' with a ' +
      delay / 1000 +
      ' second delay',
  ),
)