madrobby

Implementation of the Luhn 10 algorithm to check validity of credit card numbers. See http://en.wikipedia.org/wiki/Luhn_algorithm for details on the algorithm.

var validCreditCard = function(a,b,c,d,e){for(d=+a[b=a.length-1],e=0;b--;)c=+a[b],d+=++e%2?2*c%10+(c>4):c;return!(d%10)};

validCreditCard('378282246310005'); //=> true
validCreditCard('378282246310006'); //=> false

// some numbers to test with
// 378282246310005 371449635398431 378734493671000

madrobby

function(
  a, // a object holding test functions
  b, // a logging function, taking multiple arguments
  c, // placeholder 
  d, // placeholder
  e, // placeholder
  f  // placeholder
){
  c = d = e = 0;    // initialize asserts, failures and exception counts to 0
  for (             // iterate

madrobby

function(s,k){k=s.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})Z$/);return new Date(Date.UTC(k[1],k[2]-1,k[3],k[4],k[5],k[6]))}

madrobby

// pure JS
function shuffle(array) {
  return array.sort(function(){ 
    return .5 - Math.random(); 
  });
}

// with Prototype.js you can do
function shuffle(array){ 
  return array.sortBy(Math.random);

madrobby

config.action_controller.asset_host = Proc.new do |source, request|
  non_ssl_host = "http://asset#{source.hash % 4}.backpackit.com"
  ssl_host     = "https://asset1.backpackit.com"
  
  if request.ssl?
    case
    when source =~ /\.js$/
      ssl_host
    when request.headers["USER_AGENT"] =~ /(Safari)/
      non_ssl_host