Benchmark: filtering with Array.prototype.flatMap vs for of loop

Script Preparation code:

numbers = [
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
];

Tests:

Array.prototype.flatMap
const result = numbers.flatMap(num => num % 2 === 0 ? [num] : []);
for of loop
const result = []; for (const num of numbers) { if (num % 2 === 0) { result.push(num); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.flatMap
for of loop

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: 9 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.flatMap	182677.0 Ops/sec
for of loop	3911341.0 Ops/sec

filtering with Array.prototype.flatMap vs for of loop (version: 0)

Comparing performance of: Array.prototype.flatMap vs for of loop

Created: 9 months ago by: Guest

Jump to the latest result

Array.prototype.flatMap

for of loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A