dbrockman

- (NSUInteger)countTilesInRegionSouthWest:(CLLocationCoordinate2D)southWest
                                northEast:(CLLocationCoordinate2D)northEast
                                  minZoom:(int)minZoom
                                  maxZoom:(int)maxZoom
{
  double minLat = southWest.latitude;
  double maxLat = northEast.latitude;
  double minLon = southWest.longitude;
  double maxLon = northEast.longitude;
  

dbrockman

var digits = '0123456789' +
  'abcdefghijklmnopqrstuvwxyz' +
  'ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
  '-_';
var radix = digits.length;

function shorten_number(n) {
  var s = '';
  while (n > 0) {
    s = digits.charAt(n % radix) + s;

dbrockman

function flatten2D(array) {
  return array.reduce(function (result, item) {
    return result.concat(item);
  }, []);
}

dbrockman

function getBoundsAtLatLngWithZoom(map, center, zoom) {
  var p = map.getProjection();
  if (!p) {
    return null;
  }
  var el = $(map.getDiv());
  var zf = Math.pow(2, zoom) * 2;
  var dw = (el.width()  | 0) / zf;
  var dh = (el.height() | 0) / zf;
  var cpx = p.fromLatLngToPoint(center);

dbrockman

function randomString(length) {
  var s = ((performance.now() % 1) + Math.random()).toString(35);
  return s.substr(-Math.max(0, Math.min(length, s.length - 2)));
}

dbrockman

function jenkins_hash(s) {
  var hash = 0, i = 0, l = s.length;
  for (; i < l; ++i) {
    hash += s.charCodeAt(i);
    hash += (hash << 10);
    hash ^= (hash >> 6);
  }
  hash += (hash << 3);
  hash ^= (hash >> 11);
  hash += (hash << 15);

dbrockman

function cachedAsyncFn(fn) {
  var cached, queue;
  return function (callback) {
    if (cached) {
      process.nextTick(function () {
        callback.apply(null, cached);
      });
    } else if (queue) {
      queue.push(callback);
    } else {

dbrockman

@interface NSIndexSet (Operations)

// http://en.wikipedia.org/wiki/Union_(set_theory)
- (NSIndexSet *)unionWith:(NSIndexSet *)other;

// http://en.wikipedia.org/wiki/Intersection_(set_theory)
- (NSIndexSet *)intersectionWith:(NSIndexSet *)other;

// http://en.wikipedia.org/wiki/Complement_(set_theory)#Relative_complement
- (NSIndexSet *)relativeComplementIn:(NSIndexSet *)universe;

dbrockman

function fibonacci(n) {
  return n < 2 ? n : fibonacci(n - 2) + fibonacci(n - 1);
}

function fibonacci(n) {
  var prev, curr = 0, next = 1;
  while (n-- > 0) {
    prev = curr;
    curr = next;
    next = prev + curr;

dbrockman

function insertAt(arr, val, i) {
    arr.splice(i, 0, val);
}
function removeAt(arr, i) {
    return arr.splice(i, 1).length === 1;
}

function genericInsertAt(arr, val, i) {
    Array.prototype.splice.call(arr, i, 0, val);
}