Benchmark: isArray - MeasureThat.net

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([])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.isArray
instanceof
[].constructor
Object.prototype.toString

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 9 hours ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Windows

View result in a separate tab

Test name	Executions per second
Array.isArray	19270860.0 Ops/sec
instanceof	7393726.0 Ops/sec
[].constructor	7659906.0 Ops/sec
Object.prototype.toString	9228253.0 Ops/sec

isArray (version: 0)

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

Comparing performance of: Array.isArray vs instanceof vs [].constructor vs Object.prototype.toString

Created: 6 years ago by: Registered User

Jump to the latest result

Array.isArray

instanceof

[].constructor

Object.prototype.toString

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A