Benchmark: for vs. for-in vs. for-of vs. reduce (map object values)

Script Preparation code:

var source = {
  "box-sizing": "border-box",
  "margin": 0,
  "padding": 0,
  "border-width": 0,
  "border-style": "solid",
  "border-color": "#ddd"
}

function iteratee(value) {
  return `${value} !important`
}

Tests:

for loop
const sourceKeys = Object.keys(source) const result = {} for (let i = 0; i < sourceKeys.length; i++) { result[sourceKeys[i]] = iteratee(source[sourceKeys[i]]) }
for-in loop
const result = {} for (const key in source) { result[key] = iteratee(source[key]) }
for-of loop
const result = {} for (const key of Object.keys(source)) { result[key] = iteratee(source[key]) }
reduce
const result = Object.keys(source).reduce((memo, key) => { return { ...memo, [key]: iteratee(source[key]) } }, {})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
for-in loop
for-of loop
reduce

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:125.0) Gecko/20100101 Firefox/125.0

Browser/OS: Firefox 125 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
for loop	6971295.0 Ops/sec
for-in loop	10383360.0 Ops/sec
for-of loop	6743243.0 Ops/sec
reduce	2539649.0 Ops/sec

for vs. for-in vs. for-of vs. reduce (map object values) (version: 0)

Make a new object by applying a function to each value of the source object.

Comparing performance of: for loop vs for-in loop vs for-of loop vs reduce

Created: one year ago by: Guest

Jump to the latest result

for loop

for-in loop

for-of loop

reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A