Run results for: Join with array create versus loop and concat

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Join

3.2M/s

Loop

1.7M/s

View exact numbers

Test name	Executions per second
✓ Join	3,165,444 Ops/sec
Loop	1,682,217 Ops/sec

Script Preparation code:

window.strArray = ['aThing', 'because', 'can'];
window.myRow = {
  aThing: 's value',
  because : 'I',
  can : '!'
}

Tests:

create array and join
const id = strArray.map(elem => myRow[elem]).join(',')
straight join
let id = ''; for (const elem of strArray) { id += myRow[elem]; id += ','; }