Run results for: $ vs _

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36

Browser: Chrome 58

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
_.cloneDeep(mockObject);	115250.0 Ops/sec
jQuery.extend(true, {}, mockObject);	123312.1 Ops/sec
_.extend({}, mockObject);	1027216.1 Ops/sec
jQuery.extend({}, mockObject);	1169620.5 Ops/sec

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.compat.js"></script>

Script Preparation code:

var mockObject = {
       stuff: 'foo',
       data: _.times(15, function(n) { return 'this is ' + n; }),
       bar: {
         stuff: 'bar',
         data: _.times(15, function(n) { return 'this is ' + n; }),
         object: document.createElement('div')
       }, 
       testFunction: function() {
         return 'foo';
       }
    };

Tests:

_.cloneDeep(mockObject);
_.cloneDeep(mockObject);
jQuery.extend(true, {}, mockObject);
jQuery.extend(true, {}, mockObject);
_.extend({}, mockObject);
_.extend({}, mockObject);
jQuery.extend({}, mockObject);
jQuery.extend({}, mockObject);

who cars

_.cloneDeep(mockObject);

jQuery.extend(true, {}, mockObject);

_.extend({}, mockObject);

jQuery.extend({}, mockObject);