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

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; SM-J337AZ Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.110 Mobile Safari/537.36

Browser: Chrome Mobile 70

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
pop	1198849.0 Ops/sec
shift	1245345.0 Ops/sec
length	619572.3 Ops/sec
reassignment	871428.6 Ops/sec
.splice(0)	580171.0 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)