Run results for: Javascript 'concat()' vs '+' for strings - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36

Browser: Chrome 67

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
concat()	5058.7 Ops/sec
plus_operator	5271.1 Ops/sec
plus_eq_operator	2167.4 Ops/sec

Website performance monitoring

Script Preparation code:

var string1 = "Hello ";
var string2 = " world!";

Tests:

concat()
for(i = 0; i < 1000; i++) { var message = string1.concat(string2); }
plus_operator
for(i = 0; i < 1000; i++) { var message = string1 + string2; }
plus_eq_operator
for(i = 0; i < 1000; i++) { string1 += string2; }