Run results for: Array with Objects loop

Run details:

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

Browser: Firefox 135

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

For

232K/s

Foreach

150K/s

For-of

143K/s

map

118K/s

For-in

12K/s

View exact numbers

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)