Benchmark: Join concatenation bench

Script Preparation code:

var str = "";
var i;
var sArr = [];
var join = "-";
for (i = 1000; i > 0; i--) {
	sArr[i] = "String concatenation. ";
}

Tests:

String concatentation
var lastIndex = sArr.length - 1; for (i = 0; i < sArr.length; i++) { str += sArr[i] + (i === lastIndex ? '' : join); }
Array join
str = sArr.join(join);
Array reduce
str = sArr.reduce((a, v) => a += `${v} ${join}`, '');
Array reduce trim
str = sArr.reduce((a, v) => a += `${v} ${join}`, '').trim();
String concatentation (forEach)
var lastIndex = sArr.length - 1 sArr.forEach((value, i) => { result += value + (i === lastIndex ? '' : join) })

Rendered benchmark preparation results:

Previous results

Test case name	Result
String concatentation
Array join
Array reduce
Array reduce trim
String concatentation (forEach)

Join concatenation bench (version: 0)