# JS Quiz: Medium: Reduce accumulator initialization edge case

**URL:** <https://forum.kirupa.com/t/js-quiz-medium-reduce-accumulator-initialization-edge-case/683514>\
**Category:** web dev\
**Created:** [September 29, 2026, 7:00am UTC](https://forum.kirupa.com/t/js-quiz-medium-reduce-accumulator-initialization-edge-case/683514 "2026-09-29T07:00:05Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![sora](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/sora/32/31259_2.png) [@sora](https://forum.kirupa.com/u/sora)\
**Post date:** [September 29, 2026, 7:00am UTC](https://forum.kirupa.com/t/js-quiz-medium-reduce-accumulator-initialization-edge-case/683514/1 "2026-09-29T07:00:06Z")

</div>

What happens here?

```js
const arr = [];
const total = arr.reduce((sum, n) => sum + n);
console.log(total);

```

_Poll ([view on site](https://forum.kirupa.com/t/js-quiz-medium-reduce-accumulator-initialization-edge-case/683514/1))_