Benchmark: String concatenation vs array join vs array reduce (addition array.toString)

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("");
Array reduce
for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; } str = sArr.reduce((a, v) => a += `${v} `, '');
Array reduce trim
for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; } str = sArr.reduce((a, v) => a += `${v} `, '').trim();
toString
for (i = 1000; i > 0; i--) { sArr[i] = "String concatenation. "; } sArr.toString()

Rendered benchmark preparation results:

Previous results

String concatenation vs array join vs array reduce (addition array.toString) (version: 0)