index.js — express Source File

Architecture documentation for index.js, a javascript file in the express codebase.

File javascript ExpressCore PrototypalExtension 5 functions

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Source Code

'use strict'

/**
 * Module dependencies.
 */

var express = require('../..');
var path = require('node:path');
var User = require('./user');
var app = express();

app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// filter ferrets only

function ferrets(user) {
  return user.species === 'ferret'
}

// naive nesting approach,
// delegating errors to next(err)
// in order to expose the "count"
// and "users" locals

app.get('/', function(req, res, next){
  User.count(function(err, count){
    if (err) return next(err);
    User.all(function(err, users){
      if (err) return next(err);
      res.render('index', {
        title: 'Users',
        count: count,
        users: users.filter(ferrets)
      });
    })
  })
});




// this approach is cleaner,
// less nesting and we have
// the variables available
// on the request object

function count(req, res, next) {
  User.count(function(err, count){
    if (err) return next(err);
    req.count = count;
    next();
  })
}

function users(req, res, next) {
  User.all(function(err, users){
    if (err) return next(err);
    req.users = users;
    next();
// ... (96 more lines)