bioball

def permute(arr)
  permutation(arr.sort)
end

def permutation(arr, result=[])
  k = nil
  result += [arr.dup]
  (arr.length-1).times do |i|
    if arr[i] < arr[i+1]
      k = i

bioball

function permute(arr){
  return permutation(arr.sort());
}

function permutation(arr, result){
  result = typeof result !== 'undefined' ? result : [];
  result = result.concat([arr]);

  //find index k
  var k = null;

bioball

///////////////////////////
//// B-TREE OF ORDER 3 ////
///////////////////////////

var makeBTree = function(){

  var newBTree = {};
  var root;

//////////////////////////

bioball

var nQueens = function(n){
  if(n === 1){ return 1; }

  n = n - 1;

  var
    m     = Math.ceil(n/2),
    count = 0,
    col   = new Int8Array(n + 1),
    maj   = new Int8Array(n + n + 1),

bioball

// This is an example express middleware that can be inserted into any route that needs to be protected, assuming that authentication is done via JSON web tokens

var crypto = require('crypto');

var verifyJWTToken = function(req, res, next){
  var secret = process.env.TOKEN_SECRET;
  // 1. get the token from the headers. I'm going to go ahead and split up the three parts already
  var token = req.headers['x-access-token'].split('.');

  // 2. Get the signature, and the rest of the token. Calculate the digest with HMAC-SHA256 so we can see if it matches the signature

bioball

// here's a normal JavaScript constructor function

var Block = function(){
  this.width = 30;
  this.height = 50;
  this.otherthing = "whateverelse";
};

// these are class methods that all blocks inherit from
Block.prototype.doThing = function(){

bioball

doctype html
html
  head
    title Nothing wrong with using Jade with Angular!
  
  body(ng-app="app")
    div(ng-controller="fooController")
      h1 {{ title }}
      p {{ body }}

bioball

angular.module('app')
.factory('authentication', [
  'user',
  function(user){
    return {
      authentication: function(){
        return user.identify();
      }
    };
  }

bioball

angular.module('app')
.factory('authentication', [
  'user',
  function(user){
    return {
      authentication: function(){
        return user.identify();
      }
    };
  }

bioball

angular.module('app')
.factory('authentication', [
  'user',
  '$state',
  function(user, $state){
    return {
      authenticate: function(protect){
        return user.identify()
        .then(function(){
          return true;