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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
pop	15367090.0 Ops/sec
shift	15580063.0 Ops/sec
unshift	6.2 Ops/sec
push	2106.2 Ops/sec
index	6414.2 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; }