Benchmark: Array concat vs. array spread - MeasureThat.net

Tests:

Array concat
const arr = [1, 2, 3]; const res = arr.concat(4);
spread operator (appended)
const arr = [1, 2, 3]; const res = [...arr, 4];
spread operator (prepended)
const arr = [1, 2, 3]; const res = [0, ...arr];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array concat
spread operator (appended)
spread operator (prepended)

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: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Browser/OS: Chrome 86 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array concat	3920731.0 Ops/sec
spread operator (appended)	25489780.0 Ops/sec
spread operator (prepended)	28009280.0 Ops/sec