Run results for: Array .push() vs .unshift() + ref to last

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.87 Safari/537.36

Browser: Chrome 80

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
.unshift()	25940.2 Ops/sec
.push()	412210.2 Ops/sec

Script Preparation code:

var arr = [], last = 0

AخA
 
var arr = [], last = 0

Tests:

.unshift()
arr.unshift(42); last = arr[0]
arr.unshift(42); last = arr[0]
.push()
arr.push(42); last = arr[arr.length - 1]
arr.push(42); last = arr[arr.length - 1]