Run results for: Fastest way to check if object is empty2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
object.keys()	2222421.0 Ops/sec
JSON.stringify()	1298861.0 Ops/sec
for in	1843450.0 Ops/sec

Script Preparation code:

var xxx = {}
var yyy = {};
for (let i = 0; i < 10; ++i) {
  yyy[`key${i}`] = i;
}

function isEmpty(v) {
  for (const _ in xxx) { return false }
  return true;
}

Tests:

object.keys()
Object.keys(xxx) === 0 Object.keys(yyy) === 0
JSON.stringify()
JSON.stringify(xxx) === "{}" JSON.stringify(yyy) === "{}"
for in
isEmpty(xxx); isEmpty(yyy);

Run results for: Fastest way to check if object is empty2

You don't need to make add for loops in your test scenarios, the benchmark does it itself.

object.keys()

JSON.stringify()

for in