Run results for: string concat + join vs unshift + join (2)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

string concat + join

12.7M/s

unshift + join

8.3M/s

View exact numbers

Test name	Executions per second
✓ string concat + join	12,650,923 Ops/sec
unshift + join	8,256,636 Ops/sec

Script Preparation code:

function case1() {
  var el = 'test';
  var arr = ['foo', 'bar'];

  return el + arr.join(',');
}

function case2() {
  var el = 'test';
  var arr = ['foo', 'bar'];

  arr.unshift(el);
  return arr.join(',');
}

Tests:

string concat + join
case1()
unshift + join
case2()