Run results for: array pre alloc n

Run details:

User agent: Mozilla/5.0 (Linux; Android 11) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 106

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
none	16627.1 Ops/sec
new	16091.1 Ops/sec
length	16935.1 Ops/sec

Tests:

none

const n = 100;

function getRandomInt(max) {
    return Math.floor(Math.random() * max);
}

const arr = [];

for(let i = 0; i < n; ++i) {
  arr.push(getRandomInt(1000))
}

​x
 
const n = 100;​function getRandomInt(max) {    return Math.floor(Math.random() * max);}​const arr = [];​for(let i = 0; i < n; ++i) {  arr.push(getRandomInt(1000))}​​

new

const n = 100;

function getRandomInt(max) {
    return Math.floor(Math.random() * max);
}

const arrPre = new Array(n);

for(let i = 0; i < n; ++i) {
  arrPre[i] = getRandomInt(1000)
}

 
const n = 100;​function getRandomInt(max) {    return Math.floor(Math.random() * max);}​const arrPre = new Array(n);​for(let i = 0; i < n; ++i) {  arrPre[i] = getRandomInt(1000)}​​

length

const n = 100;

function getRandomInt(max) {
    return Math.floor(Math.random() * max);
}
const arrLen = []; arrLen.length = n;

for(let i = 0; i < n; ++i) {
  arrLen[i] = getRandomInt(1000)
}

 
const n = 100;​function getRandomInt(max) {    return Math.floor(Math.random() * max);}const arrLen = []; arrLen.length = n;​for(let i = 0; i < n; ++i) {  arrLen[i] = getRandomInt(1000)}