Benchmark: undefined vs. typeof vs. in vs. hasOwnProperty vs exists vs double bang

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };

Tests:

Rendered benchmark preparation results:

Previous results

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/119.0

Browser/OS: Firefox 119 on Mac OS X 10.15

undefined vs. typeof vs. in vs. hasOwnProperty vs exists vs double bang (version: 0)