CrabDude

Dropbox (raw)

This is a basic Dropbox clone to sync files across multiple remote folders.

Time spent: <Number of hours spent>

Features

Required

CrabDude

{
  "env": {
    "node": true,
    "es6": true
  },
  "parser": "babel-eslint",
  "rules": {
    "no-throw-literal": 1,
    "strict": "never",
    "semi": [2, "never"],

CrabDude

// @flow weak
/* jshint ignore:start */
declare module 'http' {
  declare function createServer(callback: (req: httpIncomingMessage, res: httpServerResponse) => void): httpServer
}

// declare class http {
//   createServer(callback: (req: httpIncomingMessage, res: httpServerResponse) => void): httpServer
// }

CrabDude

Node.js Callback* Contract

(aka "errback" or "error first callback")

1. Function that takes 2 arguments
   • first argument is an error
   • second argument is the result
   • Never pass both
   • error should be instanceof Error
2. Must never excecute on the same tick of the event loop
3. Must be passed as last argument to function

CrabDude

// List all files recursively within a directory with maximum parallelism
"use strict";
let path = require('path')
let fs = require('fs')
let co = require('co')
let _ = require('lodash')

Function.prototype.partial = function() {
	var args = Array.prototype.slice.call(arguments)
	args.unshift(null)

CrabDude

What: Breakfast for south bay enterprise node.js leaders

When: 8-9:30am, Friday, January 24

Where:
LinkedIn
2029 Stierlin Ct
Mountain View, CA 94043

Why: To regularly meet to discuss enterprise node.js concerns and encourage increased community in the south bay.

CrabDude

function bar() {
  return function(cb) {
		throw new Error('asdf')
		setImmediate(function() {
			cb()
		})
	}
}

function* foo() {

CrabDude

function* foo() {
  // Parallel calls with no helper lib
  var paths = ['A.js', 'B.js']
  var group = []
  for (path in paths) {
    group.push(fs.readFile(path))
  }
  var files = yield group

  // Serial calls

CrabDude

var fs = require('fs')
var $$ = require('$$')

$$(function*($) {
  var fileNames = ['A.txt', 'B.txt', 'C.txt', 'D.txt']
  for (fileName in fileNames) {
    $(fs.readFile(fileName))
  }
  var fileDataArray = yield
})

CrabDude

// Load the http module
var http = require('http');

// Setup a HTTP server, listen on port 8080
http.createServer(function (req, res) {
  res.writeHead(200, {
    'Content-Type': 'text/plain'
  });
  res.end('Hello World');
}).listen(8080, '127.0.0.1');