Minha solução para o desafio 01 do Bootcamp GoStack 2019

index.js

const express = require('express');

const server = express();

server.use(express.json());

// Banco de dados
const projects = [];
let reqNumber = 0;

// Middlewares
server.use((req, res, next) => {
  reqNumber++;
  console.log("Quantidade de requisições feitas = " + reqNumber);
  return next();
});

function checkProjectExists(req, res, next) {
  const { id } = req.params;

  projects.forEach((project) => {
    if(project.id === id) {
      return next();
    }
  });

  return res.status(400).json({ error: 'User not found' });
}

// Rotas
server.post('/projects', (req, res) => {
  projects.push(req.body);
  return res.json(projects);
});

server.get('/projects', (req, res) => {
  return res.send(projects);
});

server.put('/projects/:id', checkProjectExists, (req, res) => {
  const { id } = req.params;
  const { title } = req.body;
  
  projects.forEach((project) => {
    if(project.id === id) {
      project.title = title;
    }
  });

  return res.json(projects);
});

server.delete('/projects/:id', checkProjectExists, (req, res) => {
  const { id } = req.params;

  projects.forEach((project, index) => {
    if(project.id === id) {
      projects.splice(index, 1);
    }
  });

  return res.send();
});

server.post('/projects/:id/tasks', checkProjectExists, (req, res) => {
  const { id } = req.params;
  const { title } = req.body;

  projects.forEach((project) => {
    if(project.id === id) {
      project.tasks.push(title);
    }
  });

  return res.json(projects);
});


// Server
server.listen(3000, () => {
  console.log('Servidor em execussão na porta 3000');
});