Run results for: json stringify vs array tostring vs array join

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/134.0.6998.99 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 134

Operating system: iOS 18.0.1

Device Platform: Mobile

Date tested: one year ago

JSON.stringify

14.1M/s

toString

13.8M/s

Array.join

13.1M/s

View exact numbers

Test name	Executions per second
✓ JSON.stringify	14,092,295 Ops/sec
toString	13,807,689 Ops/sec
Array.join	13,076,328 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:

toString
makeTestData().toString()
JSON.stringify
JSON.stringify(makeTestData());
Array.join
makeTestData().join(',')