aaronlifton3

import Math._

object ScalaJSExample extends js.JSApp{
  def main(): Unit = {
    val (h, w) = (Page.canvas.height, Page.canvas.width)
    var x = 0.0
    val graphs = Seq[(String, Double => Double)](
      ("red", sin),
      ("green", x => 2 - abs(x % 8 - 4)),
      ("blue", x => 3 * pow(sin(x / 12), 2) * sin(x)),

aaronlifton3

package org.kafecho.learning.monad

import java.util.UUID

/** My attempt at implementing the Reader Monad concept.
  * The Reader Monad encapsulates a computation which:
  * - requires a dependency of type D
  * - produces values of type A.
  */
case class Reader[D, A](computation: D => A) {

aaronlifton3

# to install the latest stable version:
brew install scala --with-docs

# to install scala-2.10.0-RC1:
brew install https://raw.github.com/gist/3939012/scala.rb --with-docs

# to switch versions (from https://github.com/mxcl/homebrew/wiki/External-Commands):
brew switch scala 2.9.2
brew switch scala 2.10.0-RC1

aaronlifton3

Setting Up Clojure on OS X

I spent a lot of time trying to find a pretty optimal (for me) setup for Clojure… at the same time I was trying to dive in and learn it. This is never optimal; you shouldn't be fighting the environment while trying to learn something.

I feel like I went through a lot of pain searching Google, StackOverflow, blogs, and other sites for random tidbits of information and instructions.

This is a comprehensive "what I learned and what I ended up doing" that will hopefully be of use to others and act as a journal for myself if I ever have to do it again. I want to be very step-by-step and explain what's happening (and why) at each step.

Step 1: Getting Clojure (1.3)

aaronlifton3

type 'a monoid = {zero : 'a; plus : 'a -> 'a -> 'a}
let sum (m : 'a monoid) (l : 'a list) : 'a = List.fold_left m.plus m.zero l
let string_summer = sum {zero = ""; plus = (^)}
let int_summer = sum {zero = 0; plus = (+)}

aaronlifton3

type 'a monoid = {zero : 'a; plus : 'a -> 'a -> 'a}
let sum (m : 'a monoid) (l : 'a list) : 'a = List.fold_left m.plus m.zero l
let string_summer = sum {zero = ""; plus = (^)}
let int_summer = sum {zero = 0; plus = (+)}

aaronlifton3

$* << $0 << $$

 $$
=> 43027

$0
=> "zeus command: console"

$$
=> 43027

aaronlifton3

---
- hosts: server
  user: app_user
  gather_facts: False
  vars:
    user: app_user
    home_directory: "/home/{{ user }}"
    deploy_to: "{{ home_directory }}/app"

  roles:

aaronlifton3

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

aaronlifton3

data_bag("vhosts").each do |site|
  site_data = data_bag_item("vhosts", site)
  site_name = site_data["id"]
  document_root = "/srv/apache/#{site_name}"
 
  template "/etc/httpd/conf.d/#{site_name}.conf" do
    source "custom-vhosts.erb"
    mode "0644"
    variables(
      :document_root => document_root,