Run results for: String concatenation vs array join (with single push before)

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; SM-A505FN) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Mobile Safari/537.36

Browser: Chrome Mobile 86

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
String concatentation	1283.4 Ops/sec
Array join (with single push before)	1224.4 Ops/sec
Array join (w/ push)	704.8 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 (with single push before)
sArr.push("String concatenation. "); for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; } str = sArr.join("");
Array join (w/ push)
for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; } str = sArr.join("");