Run results for: String Concatenation

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser: Chrome 115

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

array join

366/s

array join 2

353/s

standard string append

149/s

View exact numbers

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("");