function reduceRight(collection, iteratee, accumulator, thisArg) {
      var func = isArray(collection) ? arrayReduceRight : baseReduce;
      return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
    }
This method is like `_.reduce` except that it iterates over elements of
`collection` from right to left.

@static
@memberOf _
@alias foldr
@category Collection
@param {Array|Object|string} collection The collection to iterate over.
@param {Function} [iteratee=_.identity] The function invoked per iteration.
@param {*} [accumulator] The initial value.
@param {*} [thisArg] The `this` binding of `iteratee`.
@returns {*} Returns the accumulated value.
@example

var array = [[0, 1], [2, 3], [4, 5]];
_.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []);
// => [4, 5, 2, 3, 0, 1]