Run results for: json stringify vs array join

Run details:

User agent: Mozilla/5.0 (Android 10; Mobile; rv:77.0) Gecko/77.0 Firefox/77.0

Browser: Firefox Mobile 77

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
join	2196595.0 Ops/sec
JSON.stringify	1438963.0 Ops/sec

Script Preparation code:

function moreData(arr, left) {
  if(left === 0) return arr;
  else {
    arr.push(Math.floor(Math.random() * 256));
  	return moreData(arr, left - 1);
  }
}
function makeTestData() { return moreData([], 4); }

Tests:

join
makeTestData().join('-')
JSON.stringify
JSON.stringify(makeTestData());

Run results for: json stringify vs array join

join

JSON.stringify