Run results for: join vs map js

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) Gecko/20100101 Firefox/92.0

Browser: Firefox 92

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
reduce	153.8 Ops/sec
join	169.3 Ops/sec

Script Preparation code:

var array = [];
let i = 0
for (i = 0; i < 100000; i++) {
  array.push(`${i}번째 수`);
}

Tests:

reduce
const arrayString = array.reduce((accu, curr, index) => { if (!index) accu += curr.krName; else accu += `, ${curr.krName}`; return accu; }, '');
join
const arrayString = array.join(', ');