Run results for: Array isArray vs instanceof vs variable.constructor - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser: Chrome 107

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Instanceof	1922154.9 Ops/sec
isArray	1896425.0 Ops/sec
variable.constructor	1949129.0 Ops/sec
variable.constructor name	2828815.2 Ops/sec

Script Preparation code:

var test = [1,2,3,4];
var c;

Tests:

Instanceof
if (test instanceof Array) { c++; }
isArray
if (Array.isArray(test)) { c++; }
variable.constructor
if (test.constructor === Array) { c++; }
variable.constructor name
if (test.constructor.name === 'Array') { c++; }

;