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const CronJob = require('cron').CronJob

// run once a day at midnight (0 minute of 0 hour, every day/week/month)
new CronJob('0 0 * * *', () => {
  getAllStudents.clear()
}, null, true)

jkantr

const express = require('express')
const router = express.Router()

module.exports = (Knex) => {

  router.get('/', (req, res) => {
    // now you have Knex object in scope!
    res.render('main', { title: 'Main' })
  })

jkantr

Express patterns

Parametric modules

This pattern takes advantage of lexical scope in javascript, CommonJS modules, and object destructuring. It's a good way to share stateful resources, such as a db connection object, to middleware and detached routers in Express.

Basic setup

/app.js:

const express = require('express')

jkantr

const checkStatus = (response) => {
  if (response.status >= 200 && response.status < 300) return response
  const error = new Error(`Error ${response.status}: ${response.statusText}`)
  error.response = response
  throw error
}

const parseResponse = (response) => {
  const authToken = response.headers.get(`Authorization`)
  return response.json().then(json => ({ authToken, json }))

jkantr

Array.from({ length: 100 }, (v, i) => [[15, 'fizzbuzz'], [5, 'buzz'], [3, 'fizz']].find(x => (i+1) % x[0] === 0) || (i + 1))
  .reduce((a, o) => a += (o[1] || o) + "\n",'')

jkantr

const cartesianProduct = (...args) => args.reduce((a, b) => a.map(x => b.map(y => x.concat([y]))).reduce((acc, t) => acc.concat(t), []) , [[]])

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const fetch = require('node-fetch')

function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response
  } else {
    var error = new Error(response.statusText)
    error.response = response
    throw error
  }

jkantr

const foldArr = (arr, groupSize) => arr.reduce((a, b, i, g) => !(i % groupSize) ? a.concat([g.slice(i, i + groupSize)]) : a, []);

jkantr

import requestLanguage from 'express-request-language';
import models, { Locale, User, UrlManager } from './data/models';

app.use(async (res, req, next) => {

  const locales = await Locale.findAll({}).then(locales => locales.map(loc => loc.locale));
  //app.set('locales', locales);
  req.locales = locales;
  
  next();

jkantr

const Promise = require('bluebird');
const fetch = require('node-fetch');
const cheerio = require('cheerio');

const getAllUrls = () => {
    return fetch('http://regioni.usyouthsoccer.org')
        .then(res => res.text())
        .then((html) => {
            const $ = cheerio.load(html);
            return $('#associationscarousel').find('> li > a').toArray().map(link => $(link).attr('href'))