Run results for: key exists: key in object vs !!object[key]

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Browser: Chrome 70

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
key in object	6845599.0 Ops/sec
!!object[key]	7531414.0 Ops/sec

Script Preparation code:

testObject = {'asdf': 'apple', 'afwefg': 'pear', 'hohoo': 'santa', 'country': 'usa', 'bottle': 'gin'};

Tests: