Run results for: clearing array via pop() vs shift() vs .length = 0 vs = []

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 YaBrowser/20.11.3.183 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 20

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
pop	2283495.0 Ops/sec
shift	2276124.0 Ops/sec
length	1351066.0 Ops/sec
reassignment	1585800.0 Ops/sec
.splice(0)	1774143.0 Ops/sec

Script Preparation code:

var array = [];

for(var i = 0; i < 100000; i++){array.push(Math.random());}

Tests:

pop
while (array.length > 0) { array.pop(); }
shift
while (array.length > 0) { array.shift(); }
length
array.length = 0
reassignment
array = []
.splice(0)
array.splice(0);

Run results for: clearing array via pop() vs shift() vs .length = 0 vs = []

pop

shift

length

reassignment

.splice(0)