Run results for: Array checking: isArray vs val.with - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Prop check on array	5033140.5 Ops/sec
isArray on array	4827220.5 Ops/sec
Prop check on string	4943017.5 Ops/sec
isArray on string	4884689.5 Ops/sec

Script Preparation code:

var array = [1,2,3,4];
var string = '[1,2,3,4]';
var c;

Tests:

Prop check on array
if (array.with) { c++; } else { c++; }
isArray on array
if (Array.isArray(array)) { c++; } else { c++; }
Prop check on string
if (string.with) { c++; } else { c++; }
isArray on string
if (Array.isArray(string)) { c++; } else { c++; }