Super simple synchronous forEach loop

forEachSync.js

Array.prototype.forEachSync = function(fn, done) {
  if(!this.length) return done(null);
  arr = this.reverse();

  function next(err) {
    if(err) return done(err);
    var elem = arr.pop();
    if(!elem) return done(err);

    return fn(elem, next);
  }

  return fn(arr.pop(), next);
};