Run results for: fastest isArray

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/103.1 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 15

Operating system: iOS 15.6.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Array.isArray	12937520.0 Ops/sec
instanceof	5326423.0 Ops/sec
[].constructor	5499343.0 Ops/sec
Object.prototype.toString	5278013.0 Ops/sec
obj.pop	9612937.0 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
}
function popCase(obj) {
  return obj.pop 
}
var isArray = Array.isArray

Tests:

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

Run results for: fastest isArray

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

Array.isArray

instanceof

[].constructor

Object.prototype.toString

obj.pop