Run results for: isArray

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

[].constructor

52.6M/s

Array.isArray

51.3M/s

instanceof

37.7M/s

Object.prototype.toString

25.5M/s

View exact numbers

Test name	Executions per second
✓ [].constructor	52,646,652 Ops/sec
Array.isArray	51,270,956 Ops/sec
instanceof	37,674,628 Ops/sec
Object.prototype.toString	25,528,408 Ops/sec

Script Preparation code:

var toStr = Object.prototype.toString
	
function toStrCase(obj){
  return toStr.call(obj) === '[object Array]'
}
function consCase(obj){
  return obj && obj.constructor === Array
}
function instCase(obj){
  return obj && obj instanceof Array
}
var isArray = Array.isArray

Tests:

Array.isArray
isArray([])
instanceof
instCase([])
[].constructor
consCase([])
Object.prototype.toString
toStrCase([])

Array.isArray vs Object.prototype.toString vs [].constructor vs instanceof

Array.isArray

instanceof

[].constructor

Object.prototype.toString