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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36 OPR/68.0.3618.125

Browser: Opera 68

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Instanceof	1311605.1 Ops/sec
isArray	1269903.8 Ops/sec
variable.constructor	1297483.6 Ops/sec
variable.constructor name	1833846.9 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++; }