# What does this destructuring default print?

**URL:** <https://forum.kirupa.com/t/what-does-this-destructuring-default-print/679754>\
**Category:** web dev\
**Created:** [March 31, 2026, 11:00am UTC](https://forum.kirupa.com/t/what-does-this-destructuring-default-print/679754 "2026-03-31T11:00:05Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yoshiii](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/yoshiii/32/31156_2.png) [@Yoshiii](https://forum.kirupa.com/u/Yoshiii)\
**Post date:** [March 31, 2026, 11:00am UTC](https://forum.kirupa.com/t/what-does-this-destructuring-default-print/679754/1 "2026-03-31T11:00:05Z")

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Consider this snippet.

```javascript
const { a = 5 } = { a: undefined };
console.log(a);

```

What is the output and why.

Yoshiii 🙂

---

<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:** [March 31, 2026, 11:14am UTC](https://forum.kirupa.com/t/what-does-this-destructuring-default-print/679754/2 "2026-03-31T11:14:06Z")

</div>

It prints `5` because the default is used when the property value is `undefined`, though `null` would not trigger it.

Sora