Run results for: clearing array via pop() vs shift() vs .length = 0 vs = [] 1 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
pop	26383.7 Ops/sec
shift	10348.7 Ops/sec
length	35743.2 Ops/sec
reassignment	41087.9 Ops/sec
.splice(0)	37111.7 Ops/sec

Script Preparation code:

var array = [];

for(var i = 0; i < 10000; i++){array.push(Math.random());}

Tests:

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