Run results for: Object size vs _.size

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser: Chrome 71

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Object size	4175401.0 Ops/sec
_.size	3898449.0 Ops/sec
Object keys size	4075282.0 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Script Preparation code:


Object.size = function(obj) {
    var size = 0, key;
    for (key in obj) {
        if (obj.hasOwnProperty(key)) size++;
    }
    return size;
};

Tests:

Object size
var a = {a:1,b:2,c:3,d:4}; var size = Object.size(a);
_.size
var a = {a:1,b:2,c:3,d:4}; var size = _.size(a);
Object keys size
var a = {a:1,b:2,c:3,d:4}; var size = Object.keys(a).length;

Run results for: Object size vs _.size

Compare the new ES6 spread operator with the traditional concat() method

Object size

_.size

Object keys size