Name
Array.reduceRight() — reduce an array from right-to-left
Availability
ECMAScript 5
Synopsis
array
.
reduceRight
(
f
)
array
.
reduceRight
(
f
,
initial
)
Arguments
f
A function that combines two values (such as two array elements) and returns a new “reduced” value.
initial
An optional initial value to seed the array reduction with. If this argument is specified,
reduceRight()
behaves as if it had been inserted at the end ofarray
.
Returns
The reduced value of the array, which is the return value of
the last invocation of f
.
Description
reduceRight()
works like
the reduce()
method: it invokes
the function f
n-1
times to reduce the n
elements of
array
to a single value. reduceRight()
differs from reduce()
only in that it enumerates array
elements from right to left (from highest index to lowest) rather
than left to right. See Array.reduce() for
details.
Example
[
2
,
10
,
60
].
reduceRight
(
function
(
x
,
y
)
{
return
x
/
y
})
// => 3: (60/10)/2
See Also
Get JavaScript: The Definitive Guide, 6th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.