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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
string concat + join	10527602.0 Ops/sec
unshift + join	5708046.0 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(',');
}

​x
 
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()
case1()
unshift + join
case2()
case2()