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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/118.0

Browser: Firefox 118

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Instanceof	28796264.0 Ops/sec
isArray	23998058.0 Ops/sec
variable.constructor	32885860.0 Ops/sec
variable.constructor name	34365436.0 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++; }

;