Run results for: Concat vs push(...) for large arrays

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 YaBrowser/21.9.1.600 (beta) Yowser/2.5 Safari/537.36

Browser: Yandex Browser 21

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Control (for push)	189804.6 Ops/sec
Concat	318227.2 Ops/sec
Spread	711286.1 Ops/sec

Script Preparation code:

window.top.tests = {control:[], concat:[], spread:[]};
window.test = (new Array(10)).fill(null);
window.cutoff = 5000;

Tests:

Control (for push)
for (let element of window.test) window.top.tests.control.push(element); if (window.top.tests.control.length > window.cutoff) { window.top.tests.control = []; console.log('reset control'); }
Concat
window.top.tests.concat = window.top.tests.concat.concat(window.test); if (window.top.tests.concat.length > window.cutoff) { window.top.tests.concat = []; console.log('reset concat'); }
Spread
window.top.tests.spread.push(...window.test); if (window.top.tests.spread.length > window.cutoff) { window.top.tests.spread = []; console.log('reset spread'); }

Run results for: Concat vs push(...) for large arrays

Comparing the various ways to append to a large array

Control (for push)

Concat

Spread