jucke

A/B Testing

Optimizely

click goals

measures how often visitors click an element

url targeting

jucke

// Base64 encode
val text = "This is plaintext."
val bytesEncoded = java.util.Base64.getEncoder.encode(text.getBytes())

// Base64 decode
val textDecoded = new String(java.util.Base64.getDecoder.decode(bytesEncoded))
println(textDecoded)

jucke

#!/usr/bin/env bash

ENV_PATH="$(dirname "$(dirname "$(which pip)")")"
SYSTEM_VIRTUALENV="$(which -a virtualenv|tail -1)"

BAD_ENV_PATHS="/usr/local"

echo "Ensure the root of the broken virtualenv:"
echo "    $ENV_PATH"

jucke

if (process.argv.length < 3) {
  throw `Usage: ${process.argv[1]} path_prefix`
}
const PATH_PREFIX = process.argv[2]

const path = require('path')
const AWS = require('aws-sdk')
const ssm = new AWS.SSM()

function getParametersByPath(nextToken, callback) {

jucke

Install VirtualBox guest additions onto Ubuntu server guests

Have tested these instructions successfully under an Ubuntu 16.04LTS guest with a VirtualBox 5.1 and 5.2 host.

• Install steps
• Mount with guest/host permissions matched
• Reference

Install steps

• Create Ubuntu server instance under VirtualBox (obviously).
• Start VM, goto Devices - Insert Guest Additions CD image to mount the ISO image.

jucke

Aviation

National Flight Data Center (NFDC)

https://nfdc.faa.gov/xwiki/bin/view/NFDC/WebHome

FAA Data & Research

http://www.faa.gov/data_research/

Flight Delay Information

http://www.fly.faa.gov/flyfaa/usmap.jsp

jucke

Object.defineProperty(Number.prototype,Symbol.iterator,{
  *value({ start = 0, step = 1 } = {}) {
     var inc = this > 0 ? step : -step;
     for (let i = start; Math.abs(i) <= Math.abs(this); i += inc) {
        yield i;
     }
  },
  enumerable: false,
  writable: true,
  configurable: true

jucke

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

jucke

def assert_equal(expected, actual)
  print expected == actual ? "." : "Expected #{expected.inspect} but got #{actual.inspect}\n"
end

class SummingRule
  def initialize(item, price)
    @item = item
    @price = price
  end

jucke

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.