reduceRight

Modified on Mon, 07 Aug 2023

Description

Apply an expression against an accumulator and each value of the array (from right-to-left) to reduce it to a single value.

Syntax

reduceRight(array, total, element, expression)

Parameters

Input Parameter	Type	Description
array	Array	The array reduceRight() was called upon
total	number	The initialValue, or the previously returned value of the expression. Normally, the last array element is used as initial value, and the iteration starts from the element before. If an initial value is supplied, this is used, and the iteration starts from last element.
element	any	The current element being processed in the array
expression	expression	An expression to be run for each array element. Its return value becomes the value of the accumulator parameter on the next invocation of expression

Return value

Type
number

Sample

Example	Result	Description
reduceRight( [ 1, 2, 4 ], total, x, total-x)	1	Subtract the numbers in the array, starting from the end
reduceRight( [ 1, 2, 4 ], 10, x, total-x)	9	Subtract the numbers in the array, starting from the end with initial offset of 10

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