Benchmark: Array.prototype.concat vs spread operator vs stringify

Script Preparation code:

var array1 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array2 = Array(400).fill().map(() => Math.round(Math.random() * 40));

Tests:

Array.prototype.concat
var others = array1.concat(array2);
spread operator
var others = [...array1, ...array2];
stringify
var others = JSON.parse((JSON.stringify(array1)+JSON.stringify(array2)).replace('][',','))

Rendered benchmark preparation results:

Previous results

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

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0

Browser/OS: Firefox 59 on Windows

Array.prototype.concat vs spread operator vs stringify (version: 0)