Benchmark: Concat many arrays

Script Preparation code:

const getRandomNumber = (max = 1, min = 0) =>
  Math.round(Math.random() * (max - min) + min);

window.arrays = new Array(100).fill().map(() => {
    const l = getRandomNumber(20, 10);
    const val = getRandomNumber(100);
    return new Array(l).fill(val);
  });

Tests:

Chained concat
let result = []; arrays.forEach(a => result = result.concat(a));
Single concat
const result = [].concat.apply([], arrays);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Chained concat
Single concat

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.5 Safari/605.1.15

Browser/OS: Safari 13 on Mac OS X 10.15.3

View result in a separate tab

Test name	Executions per second
Chained concat	10275.7 Ops/sec
Single concat	111150.2 Ops/sec

Concat many arrays (version: 0)

Concat chain VS single concat

Comparing performance of: Chained concat vs Single concat

Created: 4 years ago by: Guest

Jump to the latest result

Chained concat

Single concat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A