watson

Copenhagen Node.js Christmas Dinner

Date: January 6th 2018
Time: 5pm -> ?

Location

Zendesk DK HQ
Snaregade 12, 2nd floor
1205 Copenhagen

watson

#!/usr/bin/env bash

# This script is an easy way to bisect between two releases of Node.js

if [ $# -ne 2 ]; then
  echo "Error: No arguments supplied!"
  echo "Usage:"
  echo "  ./bisect.sh <git-ref> <git-ref>"
  echo
  echo "Example:"

watson

{ seq: 203248,
  id: 'testx2',
  changes: [ { rev: '1-53eafb13e023fc3a7a1b319a3eb17b2a' } ],
  doc: 
   { _id: 'testx2',
     _rev: '1-53eafb13e023fc3a7a1b319a3eb17b2a',
     name: 'testx2',
     versions: 
      { '1.0.0': 
         { dist: { tarball: 'http://registry.npmjs.org/testx2/-/a' },

watson

'use strict'

var ChangesStream = require('changes-stream')

var block = 0
var biggest = 0

var changes = new ChangesStream({
  db: 'https://replicate.npmjs.com',
  include_docs: true,

watson

var util = require('util')

util.inherits(NotFoundError, Error)

throw new NotFoundError('foo')

function NotFoundError (message) {
  Error.captureStackTrace(this, this.constructor)
  this.name = this.constructor.name
  this.message = message

watson

var request = require('request')
var JSONStream = require('JSONStream')
 
var opts = {
  url: 'https://api.github.com/users/watson/repos',
  headers: {'User-Agent': 'request'}
}

request(opts)
  .pipe(JSONStream.parse('*'))

watson

// for more info about ReDoS, see:
// https://en.wikipedia.org/wiki/ReDoS

var r = /([a-z]+)+$/
var s = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaa!'

console.log('Running regular expression... please wait')
console.time('benchmark')

r.test(s)

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[
  "😁",
  "😂",
  "😃",
  "😄",
  "😅",
  "😆",
  "😉",
  "😊",
  "😋",

watson

var assert = require('assert')
var callsites = require('error-callsites')
var MyCustomError = require('error-create')('MyCustomError')

var err = new MyCustomError('foo')

assert(err instanceof Error)
assert(err instanceof MyCustomError)
assert.doesNotThrow(function () {
  callsites(err)

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var files = ['foo.js', 'bar.js', 'foo.js']

files.forEach(function (file) {
  // this will end up reading foo.js twice
  fs.readFile(file, function (err, data) {
    // ...
  })
})