Run results for: Array length variable

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0

Browser: Firefox 78

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
With separate length variable	9277.6 Ops/sec
Without separate length variable	5490.7 Ops/sec

Script Preparation code:

array = Array(10000).fill().map(_ => Math.random());

Tests:

With separate length variable
var length = array.length; var sum = 0; for (var i = 0; i < length; ++i) { sum += array[i]; }
Without separate length variable
var sum = 0; for (var i = 0; i < array.length; ++i) { sum += array[i]; }