Benchmark: string concat and array.join

Script Preparation code:

  var characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

Tests:

join
let result = new Array(length); for (let i = 0; i < length; i++) { result[i] = characters.charAt(Math.floor(Math.random() * characters.length)); } return result.join("");
concat
let result = ""; for (let i = 0; i < length; i++) { result += characters.charAt(Math.floor(Math.random() * characters.length)); } return result;

Rendered benchmark preparation results:

Previous results

Test case name	Result
join
concat

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Windows

concat

3.3M/s

join

1.3M/s

View exact numbers

Test name	Executions per second
✓ concat	3,337,261 Ops/sec
join	1,318,814 Ops/sec

string concat and array.join (version: 0)