Run results for: add fields to objects in array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
map	862105.4 Ops/sec
forEach	1175064.9 Ops/sec
for of	1186947.0 Ops/sec

Script Preparation code:

var objects = [{
        a: 'Ghkfj',
        b: 'Yvtzq',
        c: 'Rwsde'
    },
    {
        a: 'Bpqwm',
        b: 'Sdfgh',
        c: 'Zxcvb'
    },
    {
        a: 'Olmnp',
        b: 'Iujkl',
        c: 'Qwerty'
    },
    {
        a: 'Cdsaf',
        b: 'Asdfg',
        c: 'Xcvbn'
    },
    {
        a: 'Qwerz',
        b: 'Cvbnm',
        c: 'Xcvbn'
    }
];

Tests:

map
objects = objects.map(el => ({ ...el, d: Math.random() }));
forEach
objects.forEach(el => el.d = Math.random());
for of
for (let el of objects) el.d = Math.random();

Run results for: add fields to objects in array

speed of different variants of adding field into objects in array

map

forEach

for of