function orderBy(collection, iteratees, orders, guard) {
      if (collection == null) {
        return [];
      }
      if (!isArray(iteratees)) {
        iteratees = iteratees == null ? [] : [iteratees];
      }
      orders = guard ? undefined : orders;
      if (!isArray(orders)) {
        orders = orders == null ? [] : [orders];
      }
      return baseOrderBy(collection, iteratees, orders);
    }
This method is like `_.sortBy` except that it allows specifying the sort
orders of the iteratees to sort by. If `orders` is unspecified, all values
are sorted in ascending order. Otherwise, specify an order of "desc" for
descending or "asc" for ascending sort order of corresponding values.

@static
@memberOf _
@since 4.0.0
@category Collection
@param {Array|Object} collection The collection to iterate over.
@param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
 The iteratees to sort by.
@param {string[]} [orders] The sort orders of `iteratees`.
@param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
@returns {Array} Returns the new sorted array.
@example

var users = [
  { 'user': 'fred',   'age': 48 },
  { 'user': 'barney', 'age': 34 },
  { 'user': 'fred',   'age': 40 },
  { 'user': 'barney', 'age': 36 }
];

// Sort by `user` in ascending order and by `age` in descending order.
_.orderBy(users, ['user', 'age'], ['asc', 'desc']);
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]