Run results for: Array.prototype.concat vs spread operator vs stringify

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser: Chrome 75

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

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('][',','))
concat apply
var others = Array.prototype.concat.apply([], [array1, array2]);
loop
var others = []; for (var i = 0; i < 400; i+=1) { others[i] = array1[i] } for (var i = 400; i < 800; i+=1) { others[i] = array2[i] }