Run results for: Testing isArray vs custom isArray vs pop vs array2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
isArray	2810906.0 Ops/sec
Array.isArray	3928281.0 Ops/sec
Optimized isArray1	13025610.0 Ops/sec
Optimized isArray2	6552710.0 Ops/sec
.pop	13319590.0 Ops/sec

HTML Preparation code:

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>

Script Preparation code:

var testArray = [1,2,3];
var fakeArray = 123;

var isArray = function(arr) {
    var type = Object.prototype.toString.call(arr);

    return (
        type === "[object Array]" ||
    type === "[object NodeList]" ||
    type === "[object TouchList]" ||
    type === "[object HTMLCollection]"
    );
};


var isArray2 = (arr) => arr.pop

Tests:

isArray
var a = 0; if (isArray(testArray)) { a++; }
Array.isArray
var a = 0; if (Array.isArray(testArray)) { a++; }
Optimized isArray1
var a = 0; if (testArray.length) { a++; }
Optimized isArray2
var a = 0; if (testArray && testArray.length) { a++; }
.pop
var a = 0; if (testArray.pop) { a++; }
isArray2
var a = 0; if (isArray2(testArray)) { a++; }

Run results for: Testing isArray vs custom isArray vs pop vs array2

Testing isArray vs jQuery.type === "array"

isArray

Array.isArray

Optimized isArray1

Optimized isArray2

.pop

isArray2