Run results for: isArray vs length

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Check object.length

964.2M/s

Array.isArray

251.8M/s

View exact numbers

Test name	Executions per second
✓ Check object.length	964,240,960 Ops/sec
Array.isArray	251,774,672 Ops/sec

Script Preparation code:

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

Tests: