Note: Calling reduceRight()on an empty array without an initial value is an error.
Total(required): The previously returned value of the function.
CurrentValue(Required): The value of the current element.M
Index(Optional): The index of the current element.
Arr(Optional): The array reduceRight() was called upon.
InitialValue(Optional): A value to be passed to the function as the initial value.
Return the reduced single value of the array.
RDBMS,C++, python, C, Java, MongoDB