Run results for: String concatenation vs array join precise

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

Browser: Chrome 92

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
String concatentation	2961.6 Ops/sec
Array join	38168.7 Ops/sec

Script Preparation code:

var str = "";
var i;
var sArr = new Array(1000).fill("String concatenation. ")

AخA
 
var str = "";var i;var sArr = new Array(1000).fill("String concatenation. ")

Tests:

String concatentation
for (i = 1000; i > 0; i--) { str += "String concatenation. "; }
for (i = 1000; i > 0; i--) {
str += "String concatenation. ";
}
Array join
str = sArr.join("");
str = sArr.join("");