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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/92.0.4515.90 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 92

Operating system: iOS 14.7

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
pop	17488880.0 Ops/sec
shift	17361760.0 Ops/sec
length	12056460.0 Ops/sec
reassignment	12658640.0 Ops/sec
.splice(0)	7502206.0 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)