Run results for: _.isEmpty vs Object.keys.length vs .length

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: 6 years ago

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

AخA
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

Script Preparation code:

window.obj = {};

for (var i = 0, len = 100; i < len; i++) {
  obj['key' + i] = 'value' + i;
}

​x
 
window.obj = {};​for (var i = 0, len = 100; i < len; i++) {  obj['key' + i] = 'value' + i;}

Tests:

_.isEmpty
_.isEmpty(window.obj);
_.isEmpty(window.obj);
Object.keys().length
Object.keys(window.obj).length === 0;
Object.keys(window.obj).length === 0;
.length
!window.obj.length
!window.obj.length