Run results for: Fors comparison

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

for

4K/s

forEach

2K/s

for...of

2K/s

for.. in

170/s

View exact numbers

Script Preparation code:

var tab = [];
for (let i = 0; i < 100000; ++i) {
    tab.push({
        a: i.toString(),
        b: i
    });
}

Tests:

for
for(let i = 0; i < 100000; ++i) { tab[i].a = 'aaaaaaaaaaa'; tab[i].b = 0; }
for.. in
for(let index in tab) { tab[index].a = 'bbbbbbbbb'; tab[index].b = 0; }
for...of
for(let obj of tab) { obj.a = 'cccccccccc'; obj.b = 0; }
forEach
tab.forEach((obj) => { obj.a = 'dddddddd'; obj.b = 0; });