JavaScript TypedArray reduceRight() Method.

The JavaScript reduceRight() method reduces the elements of an array into a single value and the returned value of the function is stored in an accumulator and each element in the array (from right-to-left) has to reduce it to a single value.

Note: Calling reduceRight()on an empty array without an initial value is an error.

Syntax:

Parameters:

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 value:

Return the reduced single value of the array.

Browser Support:

Chrome	Yes
Safari	4
Firefox	3.0
Opera	10.5

Example

JavaScript reduceRight() Method

<script>
// JavaScript to illustrate reduceRight() method
// Taking some array as the element of an array "A"
var A = [ ['Java','MongoDB' ], ['python','C'], [ 'RDBMS', 'C++' ] ];
 // Calling array.reduceRight() function
a = A.reduceRight((previousValue, currentValue) => previousValue.concat(currentValue));
 // printing result
document.write(a);
 // expected output: RDBMS,C++,python,C,Java,MongoDB
</script>

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Output: