Benchmark: Array with Objects loop

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const array = Array.from({
        length: 1000
    },
    function(_v, index) {
        return {
            index
        }
    }
)

Tests:

For
for (let i = 0; i < array.length; i++) { let item = array[i] item.index = i + 1 } console.log('for', array)
Foreach
array.forEach(function(item, i) { item.index = i + 1 }); console.log('forEach', array)
For-in
for (let i in array) { let item = array[i] item.index = i + 1 } console.log('for-in', array)
For-of
let i = 0 for (let item of array) { item.index = i + 1 i++ } console.log('for-of', array)
map
array.map((item,i) => { item.index = i + 1 }) console.log('map', array)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For
Foreach
For-in
For-of
map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Mac OS X 10.15

View result in a separate tab

For

226K/s

For-of

154K/s

Foreach

151K/s

map

117K/s

For-in

13K/s

View exact numbers

Test name	Executions per second
✓ For	225,924 Ops/sec
For-of	154,490 Ops/sec
Foreach	150,789 Ops/sec
map	116,928 Ops/sec
For-in	13,021 Ops/sec

Array with Objects loop (version: 2)

Loop through an array of objects and change one property

Comparing performance of: `For vs Foreach vs For-in vs For-of vs map`

Created: one year ago by: Registered User

Go to the latest result

For

Foreach

For-in

For-of

map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Array with Objects loop (version: 2)

Loop through an array of objects and change one property

Comparing performance of: For vs Foreach vs For-in vs For-of vs map

Created: one year ago by: Registered User

Go to the latest result

For

Foreach

For-in

For-of

map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `For vs Foreach vs For-in vs For-of vs map`