NodeJS - Basic todo. More of a HTTP Verb handling exercise

node_todo_http_verbs.js

var http = require('http'),
  url = require('url'),
  items = [],
  server;

server = http.createServer(function(req, res){
  switch(req.method){
    case 'POST':
      AddTodoItem(req, res, items);
      break;

    case 'GET':
      GetAllItems(res, items);
      break;

    case 'DELETE':
      EditItem(req, res, items, url, deleteItemFromArray);
      break;

    case 'PUT':
      EditItem(req, res, items, url, updateItem);
      break;

    default:
      //fail
      break;
  }
}).listen(3000);

function AddTodoItem(req, res, items){
  var item = '';
  req.setEncoding('utf8');

  req.on('data', function(chunk){
    item += chunk;
  });

  req.on('end', function(){
    items.push(item);
    res.end('OK\n');
  });
};

function GetAllItems(res, items){
  var body = items.map(function(item, i){
    return i + ') ' + item;
  }).join('\n');

  res.setHeader('Content-Length', Buffer.byteLength(body));
  res.setHeader('Content-Type', 'text/plain; charset="utf-8"');
  res.end(body);
};

function EditItem(req, res, items, url, callback){
  var path = url.parse(req.url).pathname,
    i = parseInt(path.slice(1), 10);

  if(isNaN(i)){
    res.statusCode = 400;
    res.end('Invalid item id');
  } else if(!items[i]){
    res.statusCode = 404;
    res.end('item id not found');
  } else {
    callback(items, i, req);
    res.end('OK\n');
  }
};

function updateItem(items, indexToUpdate, req){
  var newToDo = url.parse(req.url).query;

  req.setEncoding('utf8');
  items[indexToUpdate] = newToDo;
};

function deleteItemFromArray(items, indexToRemove){
  items.splice(indexToRemove, 1);
};