Run results for: isArray vs length

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0

Browser: Firefox 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Check object.length

1700.8M/s

Array.isArray

550.4M/s

View exact numbers

Test name	Executions per second
✓ Check object.length	1,700,832,384 Ops/sec
Array.isArray	550,415,296 Ops/sec

Script Preparation code:

function myIsArray(obj){
  return obj.length > 0;
}

var isArray = Array.isArray

Tests: