Run results for: pop() vs shift() vs unshift vs pop vs index - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:95.0) Gecko/20100101 Firefox/95.0

Browser: Firefox 95

Operating system: Fedora

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
pop	78021936.0 Ops/sec
shift	382079296.0 Ops/sec
unshift	46.2 Ops/sec
push	373.4 Ops/sec
index	387.2 Ops/sec

Script Preparation code:

var array = new Array(100000);

for(let i = 0; i < 100000; ++i) { array[i] = i; }

Tests:

pop
while (array.length > 0) { array.pop(); }
shift
while (array.length > 0) { array.shift(); }
unshift
let a = []; for(let i = 0; i < 100000; ++i) { a.unshift(i); }
push
let a = []; for(let i = 0; i < 100000; ++i) { a.push(i); }
index
let a = new Array(100000); for(let i = 0; i < 100000; ++i) { a[i] = i; }