Run results for: String concatenation vs array join

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; SAMSUNG SM-J700F) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/17.0 Chrome/96.0.4664.104 Mobile Safari/537.36

Browser: Chrome Mobile 96

Operating system: Android 6.0.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
String concatentation	350.6 Ops/sec
Array join	894.0 Ops/sec
Array join (w/ push)	25.8 Ops/sec

Script Preparation code:

var str = "";
var i;
var sArr = [];

Tests:

String concatentation
for (i = 1000; i > 0; i--) { str += "String concatenation. "; }
Array join
for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; } str = sArr.join("");
Array join (w/ push)
for (i = 1000; i > 0; i--) { sArr.push("String concatenation. "); } str = sArr.join("");

Run results for: String concatenation vs array join

String concatentation

Array join

Array join (w/ push)