Run results for: isArray plus name

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36

Browser: Chrome 87

Operating system: Mac OS X 10.11.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.isArray	6561377.0 Ops/sec
instanceof	2230753.0 Ops/sec
[].constructor	2243596.0 Ops/sec
Object.prototype.toString	2910358.0 Ops/sec
[].constructor.name	5061854.0 Ops/sec

Script Preparation code:

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

Tests:

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

Run results for: isArray plus name

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

Array.isArray

instanceof

[].constructor

Object.prototype.toString

[].constructor.name