Run results for: string literal vs array join

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:127.0) Gecko/20100101 Firefox/127.0

Browser: Firefox 127

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

var arr = Array(50000)
  .fill(1)
  .map(() => 'A' + Math.ceil(Math.random() * 100));

Tests:

array.join
var res=arr.join('; ');
string literal
var finalString2 = arr.reduce((res, item) => { return `${res}; ${item}`; }, '');
string concatenation
var finalString3 = arr.reduce((res, item) => { return res + '; ' + item; }, '');