Run results for: String concatenation vs array join

Run details:

User agent: Mozilla/5.0 (Linux; Android 13; CPH2339) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.5249.126 Mobile Safari/537.36 OPR/72.5.3767.69342

Browser: Opera Mobile 72

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
String concatentation	1861.2 Ops/sec
Array join	4811.3 Ops/sec
Array join (w/ push)	0.3 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)