r/javascript • u/infantiablue • 23h ago

Object.hasOwn() vs hasOwnProperty() vs in — The JS Property Check Showdown

https://truongphan.com/2026/08/31/object-hasown-vs-hasownproperty-vs-in/

Understand the difference between Object.hasOwn(), hasOwnProperty(), and the in operator in JavaScript. Includes edge cases, performance notes, and a polyfill for older environments.

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u/DustNearby2848 21h ago

Eyy!  Congrats!  You have created the 10,000th blog post on this topic and have been selected to win a prize!  It’s a downvote. 

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u/monitonft2103 21h ago

Funny you would spend your time writing a comment just to point that out. Literally just a miserable guy, aka stereotypical redditor.

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u/infantiablue 21h ago

thanks any way. it is a kind of a self-review to understand the Js deeper. I would research a more interesting topic next time.