(function(){

  // The cornerstone, an each implementation.
  // Handles objects implementing forEach, arrays, and raw objects.
  _.each = function(obj, iterator, context) {
    var index = 0;
    try {
      if (obj.forEach) {
        obj.forEach(iterator, context);
      } else if (_.isArray(obj) || _.isArguments(obj)) {
        var a = obj;
        for (var b=0, c=a.length; b<c; b++) {
          var item = a[b];
          var i = b;
          iterator.call(context, item, i, obj);
        }
      } else {
        var d = _.keys(obj);
        for (var e=0, f=d.length; e<f; e++) {
          var key = d[e];
          iterator.call(context, obj[key], key, obj);
        }
      }
    } catch (e) {
      if (e !== breaker) {
        throw e;
      }
    }
    return obj;
  };
})();