Run results for: String concatenation vs array join

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.0; LG-M250) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.81 Mobile Safari/537.36

Browser: Chrome Mobile 85

Operating system: Android 7.0

Device Platform: Mobile

Date tested: one year ago

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("");