Is it possible to manipulate the index parameter of Array.prototype.reduce?

Question

Normally the index value of Array.prototype.reduce takes the values from 0 until the Array.length. Is it possible to manipulate that value so that it starts from Array.length and descends to 0?

Can't you just reverse the array?

Henrique Barcelos
– Henrique Barcelos

2016-06-06 14:03:37 +00:00
Commented Jun 6, 2016 at 14:03 — Henrique Barcelos
– Henrique Barcelos, Commented Jun 6, 2016 at 14:03
Or use reduceRight?

Henrique Barcelos
– Henrique Barcelos

2016-06-06 14:04:38 +00:00
Commented Jun 6, 2016 at 14:04 — Henrique Barcelos
– Henrique Barcelos, Commented Jun 6, 2016 at 14:04
Or the english one :P

Clemens Himmer
– Clemens Himmer

2016-06-06 14:39:03 +00:00
Commented Jun 6, 2016 at 14:39 — Clemens Himmer
– Clemens Himmer, Commented Jun 6, 2016 at 14:39

Dmitriy Khudorozhkov · Accepted Answer · 2016-06-06 14:05:28Z

3

You can always use Array.prototype.reduceRight() for this.

answered Jun 6, 2016 at 14:05

Dmitriy Khudorozhkov

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Comments

alex · Accepted Answer · 2016-06-06 14:02:34Z

2

No, but you could always do this...

var yourNumber = arr.length - 1 - index;

...or Array.prototype.reduceRight() which will loop from last index to first (in reverse).

answered Jun 6, 2016 at 14:02

alex

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