Run results for: String Concatenation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.80 Safari/537.36

Browser: Chrome 86

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var str1 = "", 
    str2 = "", 
    str3 = "", 
    sArr1 = [],
sArr2 = new Array(30000);

Tests:

standard string append
// standard string append for (var i = 30000; i > 0; i--) { str1 += "String concatenation. "; }
array join
for (var i = 30000; i > 0; i--) { sArr1[i] = "String concatenation. "; } str2 = sArr1.join("");
array join 2
for (var i = 30000; i > 0; i--) { sArr2[i] = "String concatenation. "; } str3 = sArr2.join("");